Malicious PDF — malware analysis report

Static analysis result for SHA-256 010f385f9950f760…

MALICIOUS

PDF

74.3 KB Created: 2021-06-03 06:39:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3b7fa86415f91c519175ceffaa11e43c SHA-1: 770543a69ae4a60db2d796a3a9ef3c7dda03646f SHA-256: 010f385f9950f760f7c28fc5d7dd33b8743c5a0286e38857e9d19c48a179868b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF link farm', suggesting a malicious intent to redirect users to potentially harmful websites. The ClamAV detection and ML classifier strongly indicate maliciousness, with the primary URL pointing to a suspicious domain. No scripts were extracted, but the PDF structure itself is indicative of a phishing or SEO manipulation tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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://catamma.ru/pbw?utm_term=vespa+150+sprint+%2528vlb1t%2529+owners+manual
    • https://cdn-cms.f-static.net/uploads/4482219/normal_602c060a4bd6c.pdf
    • https://motaxajofepox.weebly.com/uploads/1/3/1/3/131381237/1897c4a0ff.pdf
    • https://cdn-cms.f-static.net/uploads/4380229/normal_6028914063db0.pdf
    • https://cdn-cms.f-static.net/uploads/4418368/normal_606b47780a49f.pdf
    • https://cdn-cms.f-static.net/uploads/4389821/normal_60206154b62b1.pdf
    • https://babixapimobikig.weebly.com/uploads/1/3/4/8/134873785/09f1a.pdf
    • https://cdn-cms.f-static.net/uploads/4488100/normal_6031b197e013b.pdf
    • https://dobuxodujunov.weebly.com/uploads/1/3/2/7/132741154/2c7012f.pdf
    • https://static.s123-cdn-static.com/uploads/4496193/normal_5fca6b2e04cfc.pdf
    • https://vibitidit.weebly.com/uploads/1/3/4/7/134712982/57d223efc1.pdf
    • https://cdn-cms.f-static.net/uploads/4404313/normal_6027967956950.pdf
    • https://static.s123-cdn-static.com/uploads/4464529/normal_5ff26ce1473b8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/8bfae39a-ee23-4097-a06a-b48cd62d9643/sharepoint_2013_workflow_retirement.pdf
    • https://uploads.strikinglycdn.com/files/cc7fb723-d4f0-4124-8264-1442518cb562/2834282265.pdf
    • https://uploads.strikinglycdn.com/files/d3a92a7a-7748-432e-9f32-0937faaf461a/fulafijapujesilonix.pdf
    • https://uploads.strikinglycdn.com/files/25fdd4fd-08bd-41b0-a70c-ca3a6f3e0cd9/extended_metaphor_meaning_and_examples.pdf
    • http://tisowowuduwe.pbworks.com/f/28667186608.pdf
    • http://gamaxidad.pbworks.com/f/pop_slots_free_chips_twitter.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cffb.bin
a4471a5e56071120f70728346eea4a45a78a067ef6efe9c29b38a8f04b60b66c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCFFB 5576 bytes
font_01_sfnt_off0000e2fa.bin
ce9daa8f20895a1e824795ae1d514841869cd12cf086e360333aaa78504de149		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FA 12580 bytes
font_02_sfnt_off00010bb3.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB3 4324 bytes

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