Malicious PDF — malware analysis report

Static analysis result for SHA-256 888bd0c1943448fb…

MALICIOUS

PDF

77.6 KB Created: 2021-06-01 19:05:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 6e8059e854213039764b290bbddccc79 SHA-1: 25ad73ada9c4c4bc3b0cf6f4537aab3b7f14e391 SHA-256: 888bd0c1943448fbf6d68f88e40b6f3ee8ed0ab792645d3bdcdff391372f42fe
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious content.

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://pistant.ru/pbw?utm_term=can+snapchat+go+in+dark+mode PDF link annotation
    • https://vufevilasok.weebly.com/uploads/1/3/4/3/134314299/gemugapakovivuset.pdfIn PDF document text
    • https://ramowofotaro.weebly.com/uploads/1/3/1/6/131607053/lepikamimaw.pdfIn PDF document text
    • https://fenogelojana.weebly.com/uploads/1/3/4/9/134904444/8765a86.pdfIn PDF document text
    • https://xojumemusip.weebly.com/uploads/1/3/4/0/134018475/gumafa_jetatize_witijusawug.pdfIn PDF document text
    • https://mesajenijapab.weebly.com/uploads/1/3/0/9/130969967/kerenibe-mopamilareke.pdfIn PDF document text
    • https://zojolutavalo.weebly.com/uploads/1/3/5/3/135345328/zafurava.pdfIn PDF document text
    • https://gibegijatu.weebly.com/uploads/1/3/5/4/135400332/woferimetagona_babonuvup.pdfIn PDF document text
    • https://totaguzoxexidi.weebly.com/uploads/1/3/2/7/132741029/6837992.pdfIn PDF document text
    • https://fosaxobe.weebly.com/uploads/1/3/4/8/134882536/7228e02.pdfIn PDF document text
    • https://nibedubuw.weebly.com/uploads/1/3/7/5/137517062/pepukoni-sagafevipaj-fupajet-rofazugosamokox.pdfIn PDF document text
    • https://jakineporop.weebly.com/uploads/1/3/5/3/135302356/8ccea38ca2df2.pdfIn PDF document text
    • https://japabipamas.weebly.com/uploads/1/3/4/4/134434218/290f99e8450.pdfIn PDF document text
    • https://kefuvarunif.weebly.com/uploads/1/3/0/7/130739830/6101117.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://siwuromo.pbworks.com/w/file/fetch/144425184/65874951734.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97ed0605-af7a-4a0d-859c-e247936b83f2/9988934362.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/651f1ede-c958-4728-8839-963d45b30c0b/putopigujuguxalezeza.pdfIn PDF document text
    • http://pezeliv.pbworks.com/f/mckenzie_technique_for_herniated_disc.pdfIn PDF document text
    • http://zekodunu.pbworks.com/f/fatisekogedadodofiwevuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60629772-6791-43a9-9fd4-6517ae22618e/xenufewizilatufi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/598e21ab-8374-4aec-bbdb-0ea8470d3bb7/vilexalezabazemopojiwujib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e325bfc-0e83-45b1-aff0-3a426a85e859/96542977642.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b99d74c3-c608-4c1c-a3e8-892eab1a1770/m_audio_keystation_88_price_in_india.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_off0000f19e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19E 5424 bytes
SHA-256: c26e4c8a0a5f9494fdd0f39ff00e4645a510e8f8a9f6d408b3a877c408166f9e
font_01_sfnt_off000103de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DE 10932 bytes
SHA-256: 83c61050efe480d969f21d869be335e1d8b8eff33a5675bbd3ed1d12f433e218