Malicious PDF — malware analysis report

Static analysis result for SHA-256 404a22e91fce59f3…

MALICIOUS

PDF

74.7 KB Created: 2021-03-27 22:53:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 261c8028bddebdfd357f3bd6b372ce4b SHA-1: 9c2f1eb60cd4cd8e5537c7b73b57fe20d042f17f SHA-256: 404a22e91fce59f35b940d5e5867feced85fe438abbc3c08152506e000db22ad
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO spamming operation. The ClamAV detection and ML classifier indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the presence of external URIs and the overall structure point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://vilenefex.ru/123?utm_term=harvard+business+case+study+template
    • https://burufazifefep.weebly.com/uploads/1/3/4/5/134584298/5107997.pdf
    • https://lokevevivepino.weebly.com/uploads/1/3/4/1/134131736/8854426.pdf
    • https://wixotavu.weebly.com/uploads/1/3/4/7/134764887/5050716.pdf
    • https://gubagomokugexat.weebly.com/uploads/1/3/3/9/133988684/jodexo.pdf
    • http://sifinujox.sportsontheweb.net/annihilation_of_caste_free.pdf
    • http://jelojutu.sportsontheweb.net/introduction_to_automata_theory_languages_and_computation_free_download.pdf
    • https://siradukezud.weebly.com/uploads/1/3/4/7/134711866/8e9b2dfb5b0a139.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nidomuku.rf.gd/scert_kerala_textbooks_for_class_5.pdf
    • https://828c6a01-da61-4814-986a-f72e64f4f334.filesusr.com/ugd/cdfdba_a6436c885f1b482f95803cdb1c3b83d6.pdf?index=true
    • https://72b50e20-f79f-40ca-96b4-24bef83e308f.filesusr.com/ugd/1a1092_3f140e9793d141eeab82d863e96f2eb5.pdf?index=true
    • http://nakepusigazu.epizy.com/apache_tomcat_for_eclipse_luna.pdf
    • https://882e4f53-a7e1-4d4a-89e8-a6e6d9f9b805.filesusr.com/ugd/9a13d2_86309f1d77d145a1836c4a4eea6f39b2.pdf?index=true
    • https://6a24fdd2-d4a5-4c4b-882b-0f3115751bcf.filesusr.com/ugd/04e6f9_c1f5667de4df453588e90cc07744c6a8.pdf?index=true
    • https://6363ce23-9394-4102-a476-7be320345719.filesusr.com/ugd/7c41c1_fc0a7230b24043f687d5ef54030db56b.pdf?index=true
    • https://s3.amazonaws.com/napisakaluja/rugetaxemejizobiziwuvomi.pdf
    • https://229c3593-bb94-4e5d-9b9f-ca3747df48ef.filesusr.com/ugd/145364_28af370613e4434f93ca8a2590dda58f.pdf?index=true
    • https://s3.amazonaws.com/kifutizijebuj/78584987533.pdf
    • http://fojosotum.myartsonline.com/is_pellet_stoves_worth_it.pdf
    • http://mevonaku.rf.gd/netgear_wgr614v7_as_repeater.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e75c.bin
327e5a03be9ea4f23c3a89a2e9cc49b2ca06a1cfa2bfe32da799ba31bdcb92a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE75C 5480 bytes
font_01_sfnt_off0000f9ef.bin
c4d356a793360699490acb700c99aa05117396be25c6ee7fc8733104db718052		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EF 10448 bytes

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