Malicious PDF — malware analysis report

Static analysis result for SHA-256 3899ec3aed182264…

MALICIOUS

PDF

71.0 KB Created: 2021-02-21 00:18:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 72e2f748f3103195ebfecb2d04bb868e SHA-1: c5e8044697bba945b2ce4c90deb19755824f106c SHA-256: 3899ec3aed1822640478fe6a3ffaf239c4ac540f585a04d13bda3d32ffd06dba
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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, suggesting a link farm or SEO spam campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/strik?utm_term=comfort+aire+ductless+air+conditioner+manual PDF link annotation
    • https://cdn.sqhk.co/dosakupu/iidChek/final_fantasy_iv_psp_pink_tail.pdfIn PDF document text
    • https://cdn.sqhk.co/telivagawu/LijyggN/juxatematukifurol.pdfIn PDF document text
    • https://rijigajigife.weebly.com/uploads/1/3/1/8/131856487/07f4030d910.pdfIn PDF document text
    • https://cdn.sqhk.co/josozudibud/jwZiaNG/geduz.pdfIn PDF document text
    • http://motawosofi.iblogger.org/23669992041.pdfIn PDF document text
    • https://cdn.sqhk.co/lenufetimop/jhijgd0/13256909097.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368242/normal_6002d18d76403.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494681/normal_600a3e16e4b1c.pdfIn PDF document text
    • https://cdn.sqhk.co/sisadenev/Vig6gi2/vegan_burger_near_me_fast_food.pdfIn PDF document text
    • https://cdn.sqhk.co/xorazasuno/iggxyhj/sql_tutorial_w3schools_create_table.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486748/normal_6021abc92cfa4.pdfIn PDF document text
    • https://cdn.sqhk.co/zotofoza/fgilDS4/vekutuzadusagibajaru.pdfIn PDF document text
    • https://vobanugan.weebly.com/uploads/1/3/5/3/135340106/wagazewewofogakas.pdfIn PDF document text
    • https://jebigifapiw.weebly.com/uploads/1/3/1/3/131379276/4043146.pdfIn PDF document text
    • https://cdn.sqhk.co/suxujaba/gjaUzAR/komudorunoza.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mevuzokekenojab/how_to_use_android_driver_in_appium.pdfIn PDF document text
    • https://s3.amazonaws.com/vavale/ncert_class_11_accountancy_notes.pdfIn PDF document text
    • https://s3.amazonaws.com/zesotat/juneau_weather_report.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_off0000d98e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98E 5072 bytes
SHA-256: 31e767764b5b1a6e292ea23a03fc7ba7b640408f3e57cdf3f8ac2de83eb44658
font_01_sfnt_off0000eab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB1 10540 bytes
SHA-256: 193c885037b260e2452559135f0466263cbd9ca097f70eff2f2a1a3c2ad32154

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