Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3c757b844d18bf6…

MALICIOUS

PDF

96.3 KB Created: 2021-05-30 20:58:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 57b44a4b72b7861610e219e6973b74f0 SHA-1: 08b7d30c9d7aaef56d3c2c100c40d452b60ed6e3 SHA-256: a3c757b844d18bf6facab040273b95494316d42602fa6860b5435ee33c986f87
156 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 5

  • 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.
  • 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/123?utm_term=integral+maths+section+test+answers PDF link annotation
    • https://jikevumuvovidu.weebly.com/uploads/1/3/4/3/134324483/kotefunujaxif.pdfIn PDF document text
    • https://botefajom.weebly.com/uploads/1/3/4/6/134690565/9907810.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385647/normal_6026e0c6e5b4d.pdfIn PDF document text
    • https://durapafived.weebly.com/uploads/1/3/1/4/131438767/5927931.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451375/normal_5fd115647c224.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486963/normal_5ffc2dd568c42.pdfIn PDF document text
    • https://ninofupefuf.weebly.com/uploads/1/3/1/8/131856131/mirula.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449629/normal_6038fb3b1beec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474445/normal_60526c131dadf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451760/normal_5ffa2005985b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393503/normal_602034848af56.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481061/normal_6059566b8b06c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454544/normal_5fe6fc315c170.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/c5e91fea-2ae1-4cb4-9df2-bbaf0b8f8c25/arctic_king_8000_btu_portable_air_conditioner_user_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/822c29fc-2c38-4904-bca1-fef1150ccfe7/how_to_use_casio_fx-300ms_s-v.p.a.m.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5078562-6edd-4731-a743-f49244ae49e3/college_physics_serway_11th_edition_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e18bfa5-7583-4eb4-ae36-465feb3f7a09/rijizezibomedused.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/167c8d51-862e-49a7-a27c-c5c86e46193e/petsafe_remote_training_collar_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f051a350-17aa-4f92-9c17-881a64f48fad/kidoge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3c7da4b-e811-483b-9047-d670c237a235/how_to_build_a_lawn_leaf_vacuum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64653f22-8343-48b3-8e35-6e1a87fdf538/lenulag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88af5902-0301-4f9a-80ad-76bb790cf88d/does_my_honeywell_thermostat_have_a_c_wire.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59e12631-02d0-4a84-93bb-e7d259c216f8/gaxugijukiduwupozudokupo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1d34ffa-1240-4923-853a-96d372534a7d/what_is_the_saying_hard_cheese.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/820a3273-9069-4632-9b9b-3f54925c8215/how_to_use_mod_function_in_scientific_calculator_fx-991es_plus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/740d08af-b51a-4476-b994-3cb42bd488b6/sat_math_section_practice_problems.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c9be430-534a-4eb9-978e-4497bc5ad608/oxford_style_manual_referencing.pdfIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000136f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136F9 5240 bytes
SHA-256: 490f42897c82152fdb9af636fff3e845ca20b480db41b888079a31f4988ddc98
font_01_sfnt_off000148b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148B5 12564 bytes
SHA-256: b48c31bfac777a96e8dea3795f084d99083decb957570bbd6d489dea22091aa3