Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4b6a19bf73e7aa3…

MALICIOUS

PDF

67.5 KB Created: 2020-11-13 15:31:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 5d4532dad54986c41ad885a76f5aacad SHA-1: 1a75155a8f86d1148266d3e135ed26cc7fbe0fd4 SHA-256: f4b6a19bf73e7aa31d7d6fffa620f1aee009818c896014ac00a03a3f1c0ab256
156 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 as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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/aws?utm_term=android+9+name+and+features PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413119/normal_5f9591c85e378.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392659/normal_5f9a3e2ea7058.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365580/normal_5f88648c0b544.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368230/normal_5f8db8707c2cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408712/normal_5fa5b1febd686.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369163/normal_5f87eeddbb67b.pdfIn PDF document text
    • https://kelawuduj.weebly.com/uploads/1/3/4/3/134330896/rujanakagin.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/fidefofudi/11_general_orders_of_a_sentry_marines.pdfIn PDF document text
    • https://s3.amazonaws.com/palevijuj/unconventional_50s_type_crossword_puzzle_clue.pdfIn PDF document text
    • https://s3.amazonaws.com/nimuwet/begrijpend_lezen_oefenen_groep_6.pdfIn PDF document text
    • https://s3.amazonaws.com/wulotugadag/50727155748.pdfIn PDF document text
    • https://s3.amazonaws.com/sukobogixe/rakdos_aggro_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/pugomonapoxuxe/74075240680.pdfIn PDF document text
    • https://s3.amazonaws.com/paxuvagal/88814298515.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/45653025297.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_off0000cda0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA0 5164 bytes
SHA-256: dd391bdb6d10d377521f9ce950c95faed887095a6f999a09bea5929d380cc695
font_01_sfnt_off0000df1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1D 10056 bytes
SHA-256: a29a415f692c56acb895123148362ad4f677df726efd288f38d2725cc678009c

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