Malicious PDF — malware analysis report

Static analysis result for SHA-256 b47c6304c82b2fff…

MALICIOUS

PDF

93.4 KB Created: 2021-04-04 08:40:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: a69a78987617e72a0751a3373c2ba0a5 SHA-1: ded098ef2d407d0bd88db8d8819dd099e8eb1f06 SHA-256: b47c6304c82b2fff1787d13828b9f0064cdd3d1f2d01871f57b024709f3652eb
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable domains, suggesting it's part of a link farm designed to redirect users to potentially harmful sites. The document body, though heavily obfuscated, appears to be a lure related to drawing graphic novels, which is used to disguise the malicious nature of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xajibur.ru/strik?utm_term=how+to+draw+graphic+novels+for+beginners PDF link annotation
    • http://nufivuzelikonax.getenjoyment.net/arduino_mega_2560_circuit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472783/normal_603542f1314fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460477/normal_5fd2f30ff3cc0.pdfIn PDF document text
    • https://cdn.sqhk.co/fusatogis/bibgfvD/bomozudisi.pdfIn PDF document text
    • http://pidawudimo.scienceontheweb.net/97638707153.pdfIn PDF document text
    • https://cdn.sqhk.co/nanovinojon/412q6JV/mtn_mpulse_cheat_http_injector.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416150/normal_603efd890dd49.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381101/normal_60609b84f40fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488314/normal_602d7fbdd6bdf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ac402fee-74f4-49a6-b5a4-6a03c6a057de.filesusr.com/ugd/b0cd75_5a5059fb39fc422784f0a0ca75c917d3.pdf?index=trueIn PDF document text
    • https://ca108e69-7b6b-43f0-8f16-d96ebeb8a33d.filesusr.com/ugd/79e0dc_88c9990dcda94654af48c8316f4307f9.pdf?index=trueIn PDF document text
    • https://48936d5e-4b15-4059-a328-ddb12afcc15e.filesusr.com/ugd/173145_945eae1b449646e28d2eff264cf4fb19.pdf?index=trueIn PDF document text
    • http://lopafulobitap.atwebpages.com/market_analysis_sample.pdfIn PDF document text
    • https://s3.amazonaws.com/zafibimutadoti/53800517410.pdfIn PDF document text
    • https://5a6df620-610b-4d6f-8f1b-71e936bb70bc.filesusr.com/ugd/1f5cef_54357bbd28044d28be584d14ed03f3b0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lemefofutomapox/11708969261.pdfIn PDF document text
    • https://0ffdd24b-620b-4f4d-94ef-a39da1ca20bd.filesusr.com/ugd/853ce2_ff2e6b908165460cb36c1c4ee0d340a5.pdf?index=trueIn PDF document text
    • https://3c8d80e7-2998-4b53-b1db-ea2053e4eee2.filesusr.com/ugd/5c8c55_36d3468428e343bda9b7425ced7b662a.pdf?index=trueIn PDF document text
    • https://cb6d8354-940b-4e05-9f1d-0150973ab277.filesusr.com/ugd/882da0_7166c86f49ff4720a49795ae1f9b68dc.pdf?index=trueIn PDF document text
    • https://a35aa970-3e4e-4c20-be1f-53d10001bce9.filesusr.com/ugd/af4e73_043ecb2d04eb42a0a58d02a1325ff88e.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12366 3256 bytes
SHA-256: 172dd93bd4b91ae221b80bbe0da194aabf113929d370be312f63183ddb3c7304
font_01_sfnt_off00012eeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EEB 5668 bytes
SHA-256: 8e5aecd17f87d9fb989f1fcd88ce84d2333850d2e0e37b0c1fc50fdd560f540a
font_02_sfnt_off00014240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14240 11172 bytes
SHA-256: 2cc5a3b3a1ad8c18c36779dbb9661ecd9437e8702749457f006a29ea56121b19