Malicious PDF — malware analysis report

Static analysis result for SHA-256 befa0abcb20408c5…

MALICIOUS

PDF

72.0 KB Created: 2021-01-16 03:47:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 847ac0371433c5e1ded244fba14e4668 SHA-1: 3c1e583003cb16b714a8e4c00612da304a35e17a SHA-256: befa0abcb20408c53b8cf9a74a26698a17baeceb802f1e61b3020a3bfb90127e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing or malware sites. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of malicious redirection, potentially leveraging embedded JavaScript for obfuscation.

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://traffine.ru/123?utm_term=a+week+in+the+woods+pdf PDF link annotation
    • https://dojudetokin.weebly.com/uploads/1/3/4/6/134613144/1096914.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377912/normal_5f9aba16d57bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384832/normal_5fd1bc3836884.pdfIn PDF document text
    • https://polopomix.weebly.com/uploads/1/3/4/8/134849819/e19723.pdfIn PDF document text
    • https://cdn.sqhk.co/govovazeket/RZJrjib/my_oldboy_gbc_emulator_free_download.pdfIn PDF document text
    • https://fuxarudoniw.weebly.com/uploads/1/3/5/3/135350341/wonifosugolofim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487903/normal_5fbb439ce7d33.pdfIn PDF document text
    • https://cdn.sqhk.co/furafurume/aigQAhj/zufolamibojerutunexano.pdfIn PDF document text
    • https://cdn.sqhk.co/nasanoroge/9l9SXMp/dilizupefunoxim.pdfIn PDF document text
    • https://totuseki.weebly.com/uploads/1/3/5/3/135322554/5836201.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453888/normal_5faf6f2aa7490.pdfIn PDF document text
    • https://cdn.sqhk.co/mepapogivoma/lidhcwI/dragon_quest_anime_characters.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406782/normal_5fc90e1d29311.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zoromexemuzid/android_callback_interface_example.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_off0000dd24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD24 4936 bytes
SHA-256: 9fb9718db028f472fec4a2afb376a0d652735bdc74488789e0a3544dd8abb9b4
font_01_sfnt_off0000ee07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE07 10916 bytes
SHA-256: 1fa1b8cec39ff4b2325494d94e03b1c50fd9b0bbae306dd450e936e39d9ee283

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