Malicious PDF — malware analysis report

Static analysis result for SHA-256 27b394fbfacb11ff…

MALICIOUS

PDF

118.2 KB Created: 2021-03-07 21:15:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 7f40ef767525e2d1f1801677c90a4fa1 SHA-1: 79d0a294a4abecd264f9169107050af4199873e3 SHA-256: 27b394fbfacb11ffa3e06c9285736bb9d9893ada8eab2c9da4fbeb5416949211
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable domains and are likely used for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the use of link farms on disposable hosting, suggesting a campaign to drive traffic to malicious sites. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://nipisod.ru/strik?utm_term=how+to+change+a+wick+in+a+square+kerosene+heater PDF link annotation
    • http://uspeh.icu/danganronpa_weight_gainssvf6.pdfIn PDF document text
    • http://reduslim-italiaoficial.site/58469458733ioal0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457570/normal_6028b5de34899.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489740/normal_5ff9bf57c61a1.pdfIn PDF document text
    • https://bigakajufejala.weebly.com/uploads/1/3/4/2/134265656/7879320.pdfIn PDF document text
    • http://gejesixave.scienceontheweb.net/64775098186.pdfIn PDF document text
    • http://dasiwujupuna.sportsontheweb.net/35354513322.pdfIn PDF document text
    • http://copyright-securityx.com/chevron_annual_report_20186xka4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4527108/normal_5fc7fcbebaf52.pdfIn PDF document text
    • https://joxetoxuluf.weebly.com/uploads/1/3/4/3/134391367/7272bd059a64.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/sojuravewi/ammoniaque_chimie_formule_chimique.pdfIn PDF document text
    • http://jolafefiluw.rf.gd/rodonatilito.pdfIn PDF document text
    • http://zawuzujuw.epizy.com/dauntless_chain_blades_guide.pdfIn PDF document text
    • http://jimarol.myartsonline.com/how_does_marvel_zombies_end.pdfIn PDF document text
    • http://jitawidavez.atwebpages.com/87323520957.pdfIn PDF document text
    • https://s3.amazonaws.com/gazivemon/cambridge_2_test_1_listening_answers.pdfIn PDF document text
    • http://zutugidod.onlinewebshop.net/is_cloud_9_on_disney_plus.pdfIn PDF document text
    • https://s3.amazonaws.com/lerezazo/gikokitit.pdfIn PDF document text
    • https://s3.amazonaws.com/vanatul/noror.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0001a419.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1A419 22652 bytes
SHA-256: 87b714fcf28f755b2d144a17e75a54954bc0b5bb5be50bcd8d2e0bb1da9276ab
font_00_sfnt_off000167b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167B7 5272 bytes
SHA-256: c7669797075b31c05f2e538984e100f517b23afb30a5d5f3d72a5e30fce0f060
font_01_sfnt_off000179b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x179B0 13760 bytes
SHA-256: e76ec6d61c0b692315ee42113ed483425b1e3a761345770788d870153336bdd2

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