Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a87051d8df1463b…

MALICIOUS

PDF

74.3 KB Created: 2021-01-29 23:42:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: fdf67adb1571650813bc223d5cf28423 SHA-1: 7bc315b65f0135aa7569b8bb0c6e71b6e786b153 SHA-256: 3a87051d8df1463b7a6511319ec0eacbb9e4cc61421a44464b1d3c014da137bc
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or redirection mechanism. While no scripts were explicitly extracted, the presence of numerous external URIs and the overall structure strongly indicate a phishing or malicious content delivery attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://crophysi.ru/123?utm_term=world+of+light+cupid+spirit+location PDF link annotation
    • https://cdn.sqhk.co/gukisafuw/ghgiiig/business_startup_grants.pdfIn PDF document text
    • https://cdn.sqhk.co/pajokiman/jivajdg/48417978221.pdfIn PDF document text
    • https://kirejoji.weebly.com/uploads/1/3/1/4/131483098/dizelurugurepew.pdfIn PDF document text
    • https://cdn.sqhk.co/vutexexukus/dAiiifW/who_dies_in_the_outsiders.pdfIn PDF document text
    • https://cdn.sqhk.co/pevejotomoma/qjdqLji/nesud.pdfIn PDF document text
    • https://maladekokox.weebly.com/uploads/1/3/4/7/134745457/nurinufobes-tefitatalizap.pdfIn PDF document text
    • https://cdn.sqhk.co/gukitane/ejcjggg/demi_lovato_skyscraper_karaoke_texty.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476002/normal_601283089ea20.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxiropuwomo/jibiihd/38834831789.pdfIn PDF document text
    • http://funiwigurogamu.iblogger.org/zugexo.pdfIn PDF document text
    • https://cdn.sqhk.co/masamiwe/S2fKcSk/95149118261.pdfIn PDF document text
    • https://cdn.sqhk.co/dugubupa/gjflggD/85990670925.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413011/normal_5fe8a4d3b1351.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424981/normal_5feec9394259b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://likasiz.epizy.com/48307513677.pdfIn PDF document text
    • http://rubaporejolo.rf.gd/bedingte_wahrscheinlichkeit_allgemeine_formel.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD099 5432 bytes
SHA-256: 10cab431615ad91c296147833b986911756764531e7a85de3c49655327fdf40c
font_01_sfnt_off0000e31f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31F 10652 bytes
SHA-256: 2440c6f2e6a25346c9deccda857db2acd6345502d14a17d9c18ea4b03a1c4679
font_02_sfnt_off00010745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10745 16092 bytes
SHA-256: e9fe716c2abc985b12a899a49d5539e4e8be1b56d50c083b30290d85a2a7c848

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