Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bb6d1ecc5a7aaef…

MALICIOUS

PDF

76.0 KB Created: 2021-05-20 14:13:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: c54fe311a7ae3344b891a5549285dc12 SHA-1: e06dfc791fd1d1e0f51a84bbb213e8ede9b73e3e SHA-256: 3bb6d1ecc5a7aaefeb7b1568de1ec883e204de3ca7e4c2937eb933659e65fd68
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which point to disposable hosting, suggesting a link farm or phishing attempt. The primary URL, 'https://botokaw.ru/strik?utm_term=how+to+unblock+minecraft+firewall', is presented as a search result, likely to trick users into clicking. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

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://botokaw.ru/strik?utm_term=how+to+unblock+minecraft+firewall PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450639/normal_603431a626b8a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413862/normal_601123df4b39c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477367/normal_606428d8cfe50.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383571/normal_5ff89343a1df4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369912/normal_5fd21eb38328f.pdfIn PDF document text
    • https://woviximanikiz.weebly.com/uploads/1/3/4/6/134693880/371856.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446942/normal_6040d87ba0326.pdfIn PDF document text
    • https://pasabegimukug.weebly.com/uploads/1/3/4/2/134265340/seziboziz_viwafokuxeji_gidurukapijug.pdfIn PDF document text
    • https://pibigetikuke.weebly.com/uploads/1/3/5/3/135387636/zojotogefuseri.pdfIn PDF document text
    • https://zirofapenepag.weebly.com/uploads/1/3/4/8/134855920/8f4bc92d4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446035/normal_5feec58394c4c.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/zosevid/text_message_abbreviations_list.pdfIn PDF document text
    • https://s3.amazonaws.com/mozedijiz/nora_roberts_books_list_series.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f602d3f-b378-499f-b762-9a26c608382b/rufuworisobaxavavewuzut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0672806b-cdf2-400f-b1eb-902290b2f632/ravuxesilosox.pdfIn PDF document text
    • https://s3.amazonaws.com/dazovosugev/crown_princess_deck_plan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39321f28-88e7-4f70-9426-8dd56b41ca0d/to_kill_a_mockingbird_poem_about_tom_robinson.pdfIn PDF document text
    • https://s3.amazonaws.com/petikamov/87148214663.pdfIn PDF document text
    • https://s3.amazonaws.com/pigolo/what_does_gdp_per_capita_mean.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ead9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD9 5104 bytes
SHA-256: 0697a5f2edca329bff323c4cdf32a0ba30a31cebef6d1e74c8c23b5aebb4ae8e
font_01_sfnt_off0000fc35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC35 10708 bytes
SHA-256: 55ba828621183e2d8e05fd6d60bb07f759da983dbda395d84e35b7e5184b58d5

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