Malicious PDF — malware analysis report

Static analysis result for SHA-256 56d9cf097bd37a91…

MALICIOUS

PDF

86.0 KB Created: 2021-03-08 06:31:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e167e0a6850f105e07f58c5fc8b87040 SHA-1: b2c5b4df364d7b3f33ded2336454f26156b4a1ce SHA-256: 56d9cf097bd37a91d55f15bdf83523fd5fcce4116c10ad5abf81fb2128f55116
134 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://xajibur.ru/wix?keyword=catia+v6+training+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4449177/normal_5ff05e28e734a.pdfIn PDF document text
    • http://gopusoduj.mygamesonline.org/quotes_against_power.pdfIn PDF document text
    • http://pililiriniru.mypressonline.com/fipofokofaj.pdfIn PDF document text
    • http://wobafobigo.mywebcommunity.org/will_there_be_a_5th_diary_of_a_wimpy_kid_movie.pdfIn PDF document text
    • http://geekcods.com/shankar_movie_songsmzqen.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447273/normal_601dae87413eb.pdfIn PDF document text
    • http://sodalabs.club/102398602203ulas.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451225/normal_5fc8649c64549.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446489/normal_603eb309551e5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452376/normal_6001905b25317.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489429/normal_6012cbe64fc7a.pdfIn PDF document text
    • http://matcobzor.ru/vajepugisokidugajurul0ctul.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414682/normal_5ffb16eb8c850.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412761/normal_5fd9baeb2a14a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455659/normal_6034bfb0a69dd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6c9aa500-f8d9-42a6-b8a4-5b3c562bbfc3.filesusr.com/ugd/543886_fcb643468e5d42d39a9760f31b70af9d.pdf?index=trueIn PDF document text
    • https://e905a76e-7bc1-418c-be29-e8eda1603e86.filesusr.com/ugd/3fb32a_e4b0de1685634effac6d2f7464800924.pdf?index=trueIn PDF document text
    • http://zevusup.atwebpages.com/dujuvubosadatokasag.pdfIn PDF document text
    • https://s3.amazonaws.com/waxegatulo/mystic_messenger_all_right_email_answers.pdfIn PDF document text
    • http://zuzopejorexa.onlinewebshop.net/what_does_cognitive_factors_mean.pdfIn PDF document text
    • https://3f9320ff-391d-49df-b192-c557e211a93c.filesusr.com/ugd/469aea_4ac6b776076f4879bb07a6951b5dd2c4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lurutopobi/sitabirisemidid.pdfIn PDF document text
    • https://84d5b3ab-51dd-4312-87b7-51df18fb3b26.filesusr.com/ugd/9ea9b6_12e687c7f171485dbb6f65e22e0ec8db.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_off0000f9e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E6 5116 bytes
SHA-256: 2308847597871fe9979a0011b8c517fe97dd23d5eae3f45e8ad0119436975447
font_01_sfnt_off00010b66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B66 12408 bytes
SHA-256: 5c52894a603927e3189ecfe53cb07d848037435a80724b6ebd37022086a586f1
font_02_sfnt_off000134a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134A9 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e