Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc8ccc9b521b6d82…

MALICIOUS

PDF

80.7 KB Created: 2020-12-19 11:36:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 4087606b8036a756da26b97212a6ab52 SHA-1: 9b7f9495ffce09503ec2b72a23b34526b273dc2e SHA-256: fc8ccc9b521b6d823b7d5742ed93fe0b4ffbe76c8da4d29bf55a136729e0bd28
186 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 0.9991

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/aws?utm_term=the+evolutionary+arms+race+answer+key PDF link annotation
    • https://fomomeku.weebly.com/uploads/1/3/2/7/132712435/kuzubep-futujufi-tebesotake.pdfIn PDF document text
    • https://mepanomelisegil.weebly.com/uploads/1/3/4/8/134899905/3843619.pdfIn PDF document text
    • https://luzatewuxajexi.weebly.com/uploads/1/3/4/2/134265782/bekikuwogijujak_davutefoxas_figakoje_gaparefofebipif.pdfIn PDF document text
    • https://nisivijuwowog.weebly.com/uploads/1/3/0/8/130813757/fagepigorezebid.pdfIn PDF document text
    • https://sonedolab.weebly.com/uploads/1/3/4/6/134630530/6704911.pdfIn PDF document text
    • https://bizetuxerupa.weebly.com/uploads/1/3/0/8/130873791/zogunulipikasajakugo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/bisazabe/game_crazy_frog_mod_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/169da68e-fb4a-4ca9-8174-611385adf99d/86941707820.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00d93b37-506c-424c-baa6-bc56daea849a/age_of_kings_skyward_battle_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6c6f262-4e46-4af3-90ad-c45c2bb7f70b/94648020743.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC17 5188 bytes
SHA-256: 3b20f10423f2fbc35b3be3aceebd69cb53adf44725dbff2f3e1f490954fa4eca
font_01_sfnt_off0000eda5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA5 11240 bytes
SHA-256: eb78ee45471faa105cf41592c492c744986c5c86d853dc72573f8b10d734bdd0
font_02_sfnt_off0001135a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1135A 16028 bytes
SHA-256: 0bae8649ba252bcfab81cb8324cfe1737d73e47191b507e117e6d0858e0066a8
font_03_sfnt_off000127a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127A5 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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