Malicious PDF — malware analysis report

Static analysis result for SHA-256 af9596a0fb27639c…

MALICIOUS

PDF

75.4 KB Created: 2021-03-28 22:37:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6c8110bd8a192cf6529f273740ae1bd9 SHA-1: 20b14cbe17d5c84b816c6000825e40bef179563c SHA-256: af9596a0fb27639c396a3557c03fbea8d4abebb006bf4d2ee62d9a737cf8684c
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, which is a common tactic for SEO manipulation or distributing malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/wix?keyword=lava+dragon+osrs+guide
    • https://jasesinokez.weebly.com/uploads/1/3/1/1/131164090/tuminonawidijofap.pdf
    • https://cdn.sqhk.co/wenisuvuroju/j5Gigha/blood_pressure_range_pregnancy_uk.pdf
    • https://cdn.sqhk.co/jotepomi/djcfhdY/mimpi_gigi_anak_copot_bagian_bawah.pdf
    • http://prizinsta24.online/how_to_write_a_pitch_email_exampleksbi4.pdf
    • http://alcozerox.com/pablo_neruda_love_poems_english_and_spanishg3lss.pdf
    • https://lulegosepo.weebly.com/uploads/1/3/0/9/130969478/4520778.pdf
    • http://chtotakoevuxom.biz/kezopumosemakodeselopir05cj.pdf
    • https://tarebizadutobi.weebly.com/uploads/1/3/4/3/134310067/sitenezemiwefozis.pdf
    • https://xebolefijepipol.weebly.com/uploads/1/3/0/7/130739937/lawat.pdf
    • http://about-central.com/75313527200lulb7.pdf
    • https://zelerajolames.weebly.com/uploads/1/3/0/7/130776056/4310987.pdf
    • https://cdn.sqhk.co/fukaxaxod/qhdAjjj/try_not_to_laugh_challenge_super_hard_clean.pdf
    • https://depasosuva.weebly.com/uploads/1/3/4/4/134483816/6508389.pdf
    • https://daxokubazab.weebly.com/uploads/1/3/1/4/131406800/2330579.pdf
    • https://rufufuwoka.weebly.com/uploads/1/3/1/4/131454634/fakexutaxowovi.pdf
    • http://hookup154.fun/25929068803ubgql.pdf
    • https://lezezirurebox.weebly.com/uploads/1/3/5/9/135967023/5231030.pdf
    • https://retetozatinum.weebly.com/uploads/1/3/0/7/130775023/07a6ee691e7371.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b4e06b7e-8a4f-4f26-b904-5afad2bf71c6/how_to_have_a_great_relationship_with_your_boyfriend.pdf
    • https://uploads.strikinglycdn.com/files/71cac680-dbf4-440d-9cf5-6c3446c5b46b/american_hybrid_a_norton_anthology_of_new_poetry.pdf
    • https://uploads.strikinglycdn.com/files/8045f900-345e-430b-9374-8a5a7d86e0d8/why_is_my_nec_phone_not_ringing.pdf
    • https://5e0c4d4d-41f9-428c-9564-b93e7cff6769.filesusr.com/ugd/510691_fc95fc215bf54391a4f49ed563f01e97.pdf?index=true
    • https://52c77544-2eb8-427c-ad0e-a8a7e2ea9366.filesusr.com/ugd/93288f_87e0593d86164b4e9ae45148b4e400c1.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e706570c-4555-442d-b2df-adc28bb0acd5/99473829287.pdf
    • https://uploads.strikinglycdn.com/files/058b663e-7ee9-4d34-8516-a0cf1485c588/will_there_be_another_mortal_engines_movie.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea62.bin
c680aa2fb6121031bbb29fd93dd6320cd9450c3e10d609138b08045e577287ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA62 4964 bytes
font_01_sfnt_off0000fb60.bin
e11343cb2b0506059fcc1be66a3dbc5555af34f796d3054dbe5961cde1a6bbe2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB60 10716 bytes

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