Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cc9fb7385ec4b9b…

MALICIOUS

PDF

72.9 KB Created: 2021-02-08 18:31:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 2464811914c3539373213b6b43743838 SHA-1: 2096d155e2cd67b15460eb0af852321f9c72866f SHA-256: 7cc9fb7385ec4b9bfe410fe7c2c91963ac8331f605c8fb7234b6c90bf221ca1a
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and extensive link farm are indicative of a phishing or malware distribution attempt.

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://druttle.ru/aws?utm_term=any+audio+converter+for+windows+7 PDF link annotation
    • http://tazikuruwuwozu.22web.org/66066196853.pdfIn PDF document text
    • http://fepemewavitik.66ghz.com/xizipugi.pdfIn PDF document text
    • https://cdn.sqhk.co/mugejufunij/djhgjhj/xajatojoligevipiwokuwi.pdfIn PDF document text
    • https://xozejobe.weebly.com/uploads/1/3/1/4/131406614/3284909.pdfIn PDF document text
    • http://fesavuxofogegil.iblogger.org/administrao_de_empresas_gilmar_masiero.pdfIn PDF document text
    • https://cdn.sqhk.co/xubuguxovim/XTqS4B5/classic_rock_radio_melbourne.pdfIn PDF document text
    • https://welaxulisura.weebly.com/uploads/1/3/4/0/134042468/xaxok.pdfIn PDF document text
    • https://laxedojopepab.weebly.com/uploads/1/3/4/8/134896069/75cd71.pdfIn PDF document text
    • https://bunosurazolenej.weebly.com/uploads/1/3/4/3/134331771/1653978.pdfIn PDF document text
    • https://cdn.sqhk.co/niripakexad/igFhbgg/lego_legacy_heroes_unboxed_release_date.pdfIn PDF document text
    • https://cdn.sqhk.co/potasuregoz/FCWOcjb/pelotajetofaw.pdfIn PDF document text
    • https://cdn.sqhk.co/zewesifadeka/HggNngh/80558919514.pdfIn PDF document text
    • https://mivebomuponi.weebly.com/uploads/1/3/1/3/131398008/93ed6.pdfIn PDF document text
    • https://lerinaxupol.weebly.com/uploads/1/3/4/6/134662503/c25e4477e.pdfIn PDF document text
    • https://cdn.sqhk.co/pijuvedozuw/jd4Uha2/ximevijine.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://basefub.epizy.com/80958113226.pdfIn PDF document text
    • http://tepisivud.epizy.com/defend_your_castle_android.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_off0000df3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3F 5308 bytes
SHA-256: e74232fce6b598cea6a4ca39bf03f9c940ca4b34fe3763671494b1d9ebdbeee2
font_01_sfnt_off0000f186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF186 11052 bytes
SHA-256: 340c3bb4db5a24bfc8f57ef6e65f07cd034c9dbf7ce0db55ec137845747e8c65

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