Malicious PDF — malware analysis report

Static analysis result for SHA-256 fae439e1dd3e44f5…

MALICIOUS

PDF

92.6 KB Created: 2021-03-24 12:30:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: f2fd686a5471edd7ae640298a4e8513b SHA-1: a13d8b55e68ec30a3ac0b8c97583172ebede885b SHA-256: fae439e1dd3e44f5ce66e0ddcca8b65b3509fcc7bf98a213941d19b07850ea97
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file is identified as malicious by both ML classification and ClamAV, with a specific detection signature indicating it's a phishing trojan. The heuristics reveal it functions as a link farm, embedding numerous external URLs, with a primary focus on SEO-related keywords. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'makalah amebiasis pdf', suggesting a potential lure or disguise for the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://soxebez.ru/award?keyword=makalah+amebiasis+pdf PDF link annotation
    • http://zipafaxelati.sportsontheweb.net/43158445942.pdfIn PDF document text
    • http://vitonidero.medianewsonline.com/rozod.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488314/normal_5ff25640bda37.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392862/normal_5ffb98029b956.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470391/normal_604122c59cb57.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465389/normal_602c1f93a1ec5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/22ec4c72-49e2-4d15-852d-4f03ce0da090/how_do_i_setup_my_tp_link_ac1200_wifi_extender.pdfIn PDF document text
    • http://wufagezigedo.onlinewebshop.net/nobody_mean_more_to_me_than_you_summary.pdfIn PDF document text
    • https://121f8fc1-d270-4171-a721-8ccd656fc20f.filesusr.com/ugd/2ca22b_ab08fa7d0e8f49c1afda86c0c06f04b6.pdf?index=trueIn PDF document text
    • http://pajupevezujugut.atwebpages.com/xujaxemudebepuw.pdfIn PDF document text
    • https://d6aab468-caab-4d9e-910f-d3bf64ae4104.filesusr.com/ugd/5438e3_cd2da3ec1cb14dccaef4698231c4b11f.pdf?index=trueIn PDF document text
    • https://bcd7deca-fd5d-492b-a220-d373ca515bc9.filesusr.com/ugd/12f4eb_a7610f50ff004da39e9bbf20e00c824e.pdf?index=trueIn PDF document text
    • http://benamow.myartsonline.com/roland_tr-808_user_manual.pdfIn PDF document text
    • https://2c549fd3-bbcc-4e43-aea5-84609313cfd4.filesusr.com/ugd/c162b3_4b2a8e148ea14bef96ac34bbb740eddf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd8dcc2d-8e1c-46e0-b665-091212565f93/the_norton_anthology_of_world_literature_3rd_edition_volume_a_b_c.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd4f7047-6456-4f7c-800d-9cab334249c3/jubanuzob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/115937a5-5b15-4da8-9245-f7e2f51f3c98/how_much_does_it_cost_to_change_a_heat_exchanger.pdfIn PDF document text
    • https://1b15a19f-c8c2-4d9d-8c2f-e97aa7ecfe2c.filesusr.com/ugd/eb6c48_6d8a62383a36438e8bf1925d7fe0893e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/29548557-0516-4373-86b9-960a0502c684/blue_jackets_hockey_reference.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9a85f42-30a7-4f15-818f-ee3db58057c7/what_is_the_number_1_marvel_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37c28bbd-439e-4490-9ce2-3a74e37fda94/after_we_collided_full_movie_free_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9b56c59-c168-4cec-848a-87b1658ab2e4/18031964685.pdfIn PDF document text
    • https://b5b764bc-4fc6-48d7-9a4b-423a4d05f225.filesusr.com/ugd/3f2390_f7b0d25bb0194b35841da9c746144cf8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc1916b9-3bdb-4c65-bf57-553bb2ea1a08/once_a_runner.pdfIn PDF document text
    • https://f64a1a0a-debf-4843-a838-a34c0cae0f4a.filesusr.com/ugd/89602e_e39f6ad51292417eba1bd2b0f8418842.pdf?index=trueIn PDF document text
    • https://a819be37-316e-4347-83bc-b067fb6953c8.filesusr.com/ugd/d5662a_e96bad324be541d9969698ad3b96c9bf.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001159f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1159F 5396 bytes
SHA-256: 3fb321032837f9df1f5b9a3de26cfa0c25c2fb432644f45d7cdb3a08c2adba4c
font_01_sfnt_off000127d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127D9 12196 bytes
SHA-256: 019e89f8315de4e3898c38480227a1b83015f39d9bf41b3220b39870db7b3194
font_02_sfnt_off00014fa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FA6 16060 bytes
SHA-256: 503f5200e83b189a546b6c6e1d808633a9135186956fe76ff9bd78de3d91e3c6