Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfe24c16cff544ed…

MALICIOUS

PDF

76.2 KB Created: 2021-03-31 09:13:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d543f197fa3c6ad8ee5b0d778a25a5aa SHA-1: 8f4be415e2d291150f5921996c072453895f9b0b SHA-256: dfe24c16cff544ed4a9bad9c738a10db72186645e9c6057cd52819b39d75b6bf
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9999

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://kuzutuzo.ru/strik?utm_term=primos+proof+cam+01+-+gen+2 PDF link annotation
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458628/normal_60580dfe118c2.pdfIn PDF document text
    • http://ketoxitigojaluk.sportsontheweb.net/differential_and_integral_calculus_problems_and_solutions.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461245/normal_6028ab8a2b5ba.pdfIn PDF document text
    • http://khareedforosh.com/34206555989mbhkg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464861/normal_60621c9e65e37.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421940/normal_6047b85caa99c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466166/normal_602ae11532b0c.pdfIn PDF document text
    • http://itwow.info/aditya_hrudayam_tamil_song60lh4.pdfIn PDF document text
    • http://viwiwasuzozu.22web.org/2010_chevy_malibu_issues.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455377/normal_60248bdf72597.pdfIn PDF document text
    • http://jekeluxuto.mywebcommunity.org/yeti_mic_settings_symbols.pdfIn PDF document text
    • http://fefosawixamuwow.22web.org/clicker_universal_garage_door_opener_genie_intellicode.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://limufij.myartsonline.com/64233290956.pdfIn PDF document text
    • https://d12e84a0-9808-45da-82c6-613dfe540d1b.filesusr.com/ugd/dc8a8e_441de48bc6d3416ca962bd19dbb3caa4.pdf?index=trueIn PDF document text
    • https://f16fa5c1-8556-4bba-8f86-04d9c108beb0.filesusr.com/ugd/2c3d75_83447a39e40f45d88c014664e3188d47.pdf?index=trueIn PDF document text
    • https://68f2566a-c586-4d15-a5d1-3a72044c38f3.filesusr.com/ugd/ecec20_f68a85af426f4de19f818788e3b0379b.pdf?index=trueIn PDF document text
    • http://nuzavaxevarap.epizy.com/blue_moon_lee_child.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE948 5664 bytes
SHA-256: dd9a698cf0608e84cbec9d2868b2680af92543cb02ed35434442a17f5ed930b0
font_01_sfnt_off0000fc85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC85 11084 bytes
SHA-256: c4a97ef4d8e38f346c222727d1b1a4de33e3647175028923e9643f2bad36c8db

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