Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfb3590c86053a88…

MALICIOUS

PDF

99.8 KB Created: 2021-02-11 11:05:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 796dd29bceb365c46d3f10f5ed6dea5e SHA-1: e763dd0621ef146c7c14cb4a1ec9e75084180166 SHA-256: dfb3590c86053a8896be10d1e60758397c70128089b8ec3eb96d2a67ee6d63f5
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 services, indicating a link farm designed to distribute traffic to various malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and extensive URL usage are indicative of techniques used to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://baarspo.ru/123?utm_term=bringing+it+all+together+worksheet PDF link annotation
    • https://cdn.sqhk.co/bobimugura/ib8hihi/57485678647.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387224/normal_6006fd9cc1536.pdfIn PDF document text
    • https://cdn.sqhk.co/numovasovev/cHidaa6/reversi_othello_strategy.pdfIn PDF document text
    • https://butopejejix.weebly.com/uploads/1/3/2/8/132814220/5775284.pdfIn PDF document text
    • https://redulexaxoxega.weebly.com/uploads/1/3/0/8/130874010/fidogow_telidi_modedejonos_nizilefiroz.pdfIn PDF document text
    • http://nulonelam.66ghz.com/xexeraradotamiziwudi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448992/normal_5fef66329c3af.pdfIn PDF document text
    • https://cdn.sqhk.co/wosuzumamig/Q0hh3Ts/37799642318.pdfIn PDF document text
    • https://cdn.sqhk.co/vufebevefo/DghOhBG/65739766524.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwonumatag/lbjdCoO/warcraft_3_reforged_heroes_models.pdfIn PDF document text
    • https://burazukukoxuvi.weebly.com/uploads/1/3/4/0/134096138/4217273.pdfIn PDF document text
    • https://cdn.sqhk.co/feletitami/gjG6Chj/funny_ringtones_for_iphone_11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375357/normal_5fe9e6b095ea8.pdfIn PDF document text
    • https://jelezasi.weebly.com/uploads/1/3/5/3/135347821/digivanufonab-famafirolawefoz-rajowuweb-balez.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4394073/normal_5fededa5885a1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425229/normal_60017f86c4168.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00014d2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D2B 5152 bytes
SHA-256: 7537087c3eeb116352324129be3c051878cb1d375821a23fbbf7778c74e8e2e9
font_01_sfnt_off00015ebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EBC 10440 bytes
SHA-256: ac0cf663c84137c882522c952642dbbf861af9b64454f30a29caefbd367d0a3b

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