Malicious PDF — malware analysis report

Static analysis result for SHA-256 8571ce11775b26ec…

MALICIOUS

PDF

79.2 KB Created: 2021-02-26 12:53:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: fb41f7eb9ff29a27ab6b152ce8eb0387 SHA-1: 94af6a845e3a3fc0a026659dbc3935de1c6d65c8 SHA-256: 8571ce11775b26ecdba7e70874882761763e0d897f969b275e330de9ccdd385e
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 hosted on disposable domains, indicating a link farm or SEO manipulation attempt. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of embedded URLs and the nature of the link farm suggest an attempt to redirect users to malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/strik?utm_term=bissell+lift+off+not+spraying+water PDF link annotation
    • http://zidujuwus.iblogger.org/zabidelem.pdfIn PDF document text
    • https://kesizimi.weebly.com/uploads/1/3/1/3/131398366/xagogetoxatenepu.pdfIn PDF document text
    • https://tetizapafatig.weebly.com/uploads/1/3/4/6/134634663/vubev_xixenar.pdfIn PDF document text
    • http://xujilutobidiko.iblogger.org/poemas_cortos_de_poeta_en_nueva_york.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412773/normal_6006ff2a7350e.pdfIn PDF document text
    • https://xevivipemasap.weebly.com/uploads/1/3/4/4/134481894/a81b80da61a.pdfIn PDF document text
    • https://fivujage.weebly.com/uploads/1/3/4/3/134316273/224ad41.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391008/normal_60246f6623cd7.pdfIn PDF document text
    • https://pugiputofal.weebly.com/uploads/1/3/4/7/134740318/5903877.pdfIn PDF document text
    • https://zibizunazop.weebly.com/uploads/1/3/2/7/132710786/69b568d60.pdfIn PDF document text
    • https://vaxatimiroxak.weebly.com/uploads/1/3/4/6/134617636/juwopowa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412761/normal_60185bb7c7a9f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kopinakitiwodad.rf.gd/lixopiwokozapowotejupatim.pdfIn PDF document text
    • http://loxosufodu.epizy.com/glows_and_grows_template_word.pdfIn PDF document text
    • http://vizawog.epizy.com/17413413866.pdfIn PDF document text
    • http://xufizup.rf.gd/51485528358.pdfIn PDF document text
    • http://luniwopekesoto.rf.gd/diabetic_foot_assessment_template.pdfIn PDF document text
    • http://rebopugosive.rf.gd/13775424241.pdfIn PDF document text
    • http://defizal.epizy.com/cartoon_car_video.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_off0000fa5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5C 5312 bytes
SHA-256: 4d474efbd2b471659915ec75f18817e9144f6542117d63006e9b8796eae3392e
font_01_sfnt_off00010c9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9D 10192 bytes
SHA-256: 0af208cd130241eee22a90921a822c1780bc94a27508421e32f6efe961b52ef4

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