Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fc0acc95a33772f…

MALICIOUS

PDF

70.0 KB Created: 2021-06-01 23:48:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: aa51eac507dd6f2896825a9ab196cbcd SHA-1: 8915f841f31d6698e8d51cff7e17021450d4219c SHA-256: 5fc0acc95a33772fb06e7813a40cfbef471d11b73fde947cb9e12dad3c108a04
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 0.9998

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://irlanc.ru/pbw?utm_term=a+christmas+element+word+search+answers PDF link annotation
    • https://bajurajatug.weebly.com/uploads/1/3/6/0/136054821/3323649.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497658/normal_605f78dbc7658.pdfIn PDF document text
    • https://tofavasexivefet.weebly.com/uploads/1/3/4/5/134578877/buzituxalete_pefofoj_juzotaxegufam.pdfIn PDF document text
    • https://konegodifoxud.weebly.com/uploads/1/3/1/3/131380175/fcc836137.pdfIn PDF document text
    • https://boluzevorekov.weebly.com/uploads/1/3/1/3/131384542/xesibexemejaketewok.pdfIn PDF document text
    • https://jugozufenuw.weebly.com/uploads/1/3/4/2/134266135/2783340.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426819/normal_5fcd26cb7530c.pdfIn PDF document text
    • https://nudimulax.weebly.com/uploads/1/3/6/0/136010194/6e9bb80e54b3a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mukibilevejo.pbworks.com/w/file/fetch/144473331/60446600664.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0078e6be-6f92-4342-8a4b-d2fe56ff305f/together_is_better_simon_sinek_amazon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3818180-2559-4d66-a086-1601123ebc86/40847558527.pdfIn PDF document text
    • http://pamotekegopa.pbworks.com/f/89658924208.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8878c113-1db6-40d2-bc52-b9b8cce8b067/tegosero.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81435e61-bc0d-4e62-b9b2-17483c54ae93/how_to_use_auto_clicker_in_growtopia_android.pdfIn PDF document text
    • http://lekipirunezi.pbworks.com/f/what_is_the_difference_between_awg_and_mm2.pdfIn PDF document text
    • http://wuwazilizos.pbworks.com/w/file/fetch/144424767/what_are_the_different_types_of_intermolecular_forces_of_attraction_from_strongest_to_weakest.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4c2c61e-899f-49df-8dd2-84f61bfd0390/jikogezorabuto.pdfIn PDF document text
    • http://barumena.pbworks.com/w/file/fetch/144441030/is_ada_wong_a_villain.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_off0000d5c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C5 5260 bytes
SHA-256: 1f9289122bac75bcd161deefc0c29375c8c345673c3d678f56fd3e7a2d4a9cef
font_01_sfnt_off0000e789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE789 10404 bytes
SHA-256: eb9b3d39d9f090326cc02b6a3ae6becfc48df0389c4e70221b37bd48df87a2e8

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