Malicious PDF — malware analysis report

Static analysis result for SHA-256 80b4fb42b97fe9ef…

MALICIOUS

PDF

65.5 KB Created: 2021-01-14 02:39:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 7fc900d2a38223d1d70e6873c68cb6b2 SHA-1: 6161b3b769176fe8a7f44ef1fb65109ceafe6cc6 SHA-256: 80b4fb42b97fe9efd89d60facc95d7c6df0be69d6cf1badadee92acfa6e69561
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The document contains numerous embedded URLs, suggesting it functions as a link farm or phishing lure, directing users to external sites for potential exploitation. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://traffine.ru/123?utm_term=ps4+disk+drive+parts PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4403117/normal_5feec9ee994d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390643/normal_5fd09de371ae2.pdfIn PDF document text
    • https://site-1175316.mozfiles.com/files/1175316/snappp_caption_remover_for_snapchat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487192/normal_5fb3454c54413.pdfIn PDF document text
    • https://cdn.sqhk.co/muligumixe/jihhijP/minecraft_mods_1._16._14.pdfIn PDF document text
    • https://site-1177285.mozfiles.com/files/1177285/word_cash_answers.pdfIn PDF document text
    • https://site-1216672.mozfiles.com/files/1216672/bewars_movie_songs_naa_song.pdfIn PDF document text
    • https://cdn.sqhk.co/jisogixij/gejfdia/download_real_dragon_simulator_3d_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387815/normal_5fa4b80ce3275.pdfIn PDF document text
    • https://cdn.sqhk.co/bitomasijelo/a2ut8ig/williams_comet_pinball_parts.pdfIn PDF document text
    • https://site-1209466.mozfiles.com/files/1209466/70841520582.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463807/normal_5fd14997b7b62.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473903/normal_5fe21533c598a.pdfIn PDF document text
    • https://site-1168239.mozfiles.com/files/1168239/dexatarofuzikawawemab.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_off0000c36f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC36F 5136 bytes
SHA-256: 4b708541f79c90919e2dba060c043de77340f882b58a11912c116b0e0ad09a70
font_01_sfnt_off0000d507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD507 10140 bytes
SHA-256: aebb8de0a944818486b9d8dc68face4f5c621e420914ea37e6968372dac08e9d

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