Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c0667331bba7fdd…

MALICIOUS

PDF

78.4 KB Created: 2021-03-15 11:24:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: f6db13e78814b57b3b26e37d95667f16 SHA-1: 8c5b06565803241e2d5c28b88cfe52932063fd65 SHA-256: 7c0667331bba7fdd1e98afa9699780da97323f4f244935b4f8b5934b2c244c82
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. One of the embedded URLs, 'https://vilenefex.ru/strik?utm_term=diablo+3+necromancer+pestilence+build+season+17', is particularly suspicious and likely serves as a redirect to malicious content or a phishing page.

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://vilenefex.ru/strik?utm_term=diablo+3+necromancer+pestilence+build+season+17 PDF link annotation
    • https://berisojelo.weebly.com/uploads/1/3/0/8/130874511/rekatopudadejup.pdfIn PDF document text
    • https://sukopowe.weebly.com/uploads/1/3/4/4/134499194/4cb33dd7ff05e70.pdfIn PDF document text
    • http://usesoda.pro/rufinodaxagidiruwukroiq.pdfIn PDF document text
    • http://zebisol.mypressonline.com/35961176079.pdfIn PDF document text
    • http://nurigoluda.mygamesonline.org/pazudifirosakus.pdfIn PDF document text
    • https://xejinifinedi.weebly.com/uploads/1/3/5/3/135305438/mevewapano.pdfIn PDF document text
    • https://gubizelejipeter.weebly.com/uploads/1/3/4/1/134131403/3641413.pdfIn PDF document text
    • https://pegepujime.weebly.com/uploads/1/3/1/4/131453637/rejokosovefolugok.pdfIn PDF document text
    • http://hdvideo.design/zovobikipuwurejewekurasijnbkzv.pdfIn PDF document text
    • http://mydenverneighborhoods.com/the_evening_sun_faulkner_summaryxs91y.pdfIn PDF document text
    • http://fezufizibum.mypressonline.com/11915619929.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8596d593-4aee-4c97-81d6-4c11f77e534d/read_the_truth_about_forever_online_free.pdfIn PDF document text
    • https://5e3b32e6-a537-4a58-a531-ef303a468713.filesusr.com/ugd/120874_8f0db7be9e024087927945ed4ccafbb7.pdf?index=trueIn PDF document text
    • https://2c5a832e-93c4-4ab0-bef0-969ef348d747.filesusr.com/ugd/cc5daa_16792875d58b498eb1a560c04b7cfbc0.pdf?index=trueIn PDF document text
    • https://6d706a39-1f93-4f1a-9423-caccf7e65e71.filesusr.com/ugd/69f91f_81f15da2d4c44ce4be356e4ee33c4fea.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/549cf9ff-b2b4-46eb-9dc7-d0e6deeccdf6/where_to_drop_off_unwanted_clothing_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7da77b3b-c4d7-40a8-9f8c-ce7c8dc378bf/16149257662.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c49ffa8f-fca8-4139-872c-13da3775964e/nikon_m_308_bdc_scope_for_sale.pdfIn PDF document text
    • https://ef4f51cf-aae9-439d-85d5-db2134c8a05d.filesusr.com/ugd/8a9083_6863431f48c048938221df10b45187aa.pdf?index=trueIn PDF document text
    • https://ac402fee-74f4-49a6-b5a4-6a03c6a057de.filesusr.com/ugd/b0cd75_b1f9de7c698f4931bb12193f1b2a63c4.pdf?index=trueIn 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_off0000f3b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B2 5656 bytes
SHA-256: 2a7a624849953d057c7df194658338d5589a0f9e43e15557f3bfd4f5e981a530
font_01_sfnt_off000106de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DE 10920 bytes
SHA-256: 3f67861d3349dd8657264047088cf25dd1d40094f35e951f58bd36c273c85008