Malicious PDF — malware analysis report

Static analysis result for SHA-256 84f9569f027abca5…

MALICIOUS

PDF

85.4 KB Created: 2021-05-13 07:02:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 77dda2833e42ba19580aaf17338231a6 SHA-1: 018fd6ec2a88658ae1e145c62f3e4c88ea97dba1 SHA-256: 84f9569f027abca5811a2915d3e2050e6466972fc87e25fa38a94841043a2e8e
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://botokaw.ru/strik?utm_term=how+much+did+the+cast+of+50+shades+make PDF link annotation
    • https://cdn.sqhk.co/febapaji/hgEvsgv/cossack_squats_with_kettlebell_goblet_hold.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465389/normal_60314c67115c5.pdfIn PDF document text
    • https://cdn.sqhk.co/pinofizulag/e9ZPL1E/secret_of_mana_remake_switch_2019.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412568/normal_601555aee07d4.pdfIn PDF document text
    • https://cdn.sqhk.co/guledijuxi/fhhibjf/download_wartide_heroes_of_atlantis_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488335/normal_6017fcc4c21ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443578/normal_604a217ecacdf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://dc5983eb-04eb-4341-be6e-5f763cf8c8d0.filesusr.com/ugd/979c04_aec3dcd2afde4c05bc10bce8145e04da.pdf?index=trueIn PDF document text
    • https://5ccda086-29c7-4024-8a93-689df1f3b89c.filesusr.com/ugd/ed8107_17916cb340a24401bd64bfa490469009.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wutezigojuxi/pexuwuxip.pdfIn PDF document text
    • https://07d68bf2-0661-47e2-9ffe-eae068a071af.filesusr.com/ugd/fef806_da91c62c786b4bff937c05ef5cb4c626.pdf?index=trueIn PDF document text
    • https://05282879-aed3-4f16-ac14-d534add4d4bd.filesusr.com/ugd/0f8b7c_930717cdf8d04db281274576060f4c27.pdf?index=trueIn PDF document text
    • https://fad58b31-c538-4d3f-828d-7998eec853b9.filesusr.com/ugd/7e6083_0f709e39fbb148c987103ac065c8fa6c.pdf?index=trueIn PDF document text
    • https://6acf0ca1-aa41-4771-8b91-54baff69ee7f.filesusr.com/ugd/7d1dc9_d2c1ce7805fa400f8e9a92d8cc7d1947.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jigezilor/20134649673.pdfIn PDF document text
    • https://0306adf0-382e-42f1-903d-71c3961c97f1.filesusr.com/ugd/7ff653_005327ff5ae14d13bcf640bd3ae26283.pdf?index=trueIn PDF document text
    • https://1eb42bdc-3da6-4b32-b75f-4382f1721f8e.filesusr.com/ugd/35474d_d5d4fba689df4e749a238a795c99b2a8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zevutebulaworel/56028965712.pdfIn PDF document text
    • https://s3.amazonaws.com/kefefetafij/67701089716.pdfIn PDF document text
    • https://369206df-e466-4f8f-9771-850d1edb33c5.filesusr.com/ugd/8fd5dc_61d5130dd8014ca781b0e2dc307d3f81.pdf?index=trueIn PDF document text
    • https://45f91bdd-2b68-4e60-ae2c-b14373ae5332.filesusr.com/ugd/0d089b_0623b57c7d7444babb841223ac86d780.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000103f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F5 5292 bytes
SHA-256: f25999a55606b46a9c0585af51954f1c3ad5363415b1b8934dc255b6519200d7
font_01_sfnt_off00011611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11611 10296 bytes
SHA-256: e285778de553c1f9f111afcf02b3751464d5db1ac73b29dbbfbf8146f80c17f0
font_02_sfnt_off00013956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13956 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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