Malicious PDF — malware analysis report

Static analysis result for SHA-256 33fccf8f4aec43a7…

MALICIOUS

PDF

82.1 KB Created: 2021-04-01 18:20:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3c1789121ea90e9a777fba7523f988a0 SHA-1: 2a202e4facf52d7baed49424ad3ae3651b919485 SHA-256: 33fccf8f4aec43a75c95d4243729f2f39e9397e15782fdbf2875c048897a21cf
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier also indicate maliciousness. While no scripts were directly extracted, the presence of numerous external URLs points towards an attempt to redirect users to potentially harmful sites, possibly for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ponafet.ru/strik?utm_term=should+covid+be+capitalized+in+a+sentence
    • https://cdn-cms.f-static.net/uploads/4486053/normal_601f3c72738ed.pdf
    • https://cdn-cms.f-static.net/uploads/4426409/normal_605b4662a0988.pdf
    • https://zirakamu.weebly.com/uploads/1/3/1/3/131398357/1898763.pdf
    • https://cdn-cms.f-static.net/uploads/4496001/normal_6052621704b2b.pdf
    • http://zaxevef.getenjoyment.net/92497635463.pdf
    • https://zazalefofano.weebly.com/uploads/1/3/4/5/134578352/7731f8da655305b.pdf
    • https://static.s123-cdn-static.com/uploads/4370989/normal_5fd088e523bf6.pdf
    • http://goladelexugezi.sportsontheweb.net/40666330617.pdf
    • https://kapibazagazibu.weebly.com/uploads/1/3/5/3/135347450/1902027.pdf
    • https://cdn-cms.f-static.net/uploads/4469359/normal_5fd81403ec5c0.pdf
    • https://xubebedi.weebly.com/uploads/1/3/0/7/130776367/vulegumifuxiw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://a84030a7-2e48-4039-807a-383e2b7216cc.filesusr.com/ugd/c5d40f_7bd6a140234b4ea2addbe59c2e582f48.pdf?index=true
    • https://44879a12-c10a-431c-a98a-7de142752d0f.filesusr.com/ugd/bb4607_b4d43a8f424f48169822560c02287968.pdf?index=true
    • https://e7e1611e-f78d-4dfd-b5ce-3be5f579732f.filesusr.com/ugd/4b76a6_ca6f1f1729e945e2a51963281f7d089e.pdf?index=true
    • https://8b8c7005-3af0-45a1-8e5b-a6902caa9335.filesusr.com/ugd/dbd7d9_572ec485cffb46e39fe135fb7a5e9358.pdf?index=true
    • https://de2a8dfc-dc8d-4d62-be3b-f97abdd17bf6.filesusr.com/ugd/c722c2_683a209c015740b1b3f01986552e8215.pdf?index=true
    • https://4fe85328-8dbf-40e9-afa8-2c8d6ff8a9c8.filesusr.com/ugd/9c0842_e4c19bccb3244d8f901570d49aeebe1f.pdf?index=true
    • https://dacf5b84-f80e-4bd8-bb7f-22aad20a1cd8.filesusr.com/ugd/285be4_b24e60046b0f4c7aadb2e0a2010767ec.pdf?index=true
    • https://01d7ec8a-e38e-4e33-8c76-1be31754498b.filesusr.com/ugd/24d943_5ed193abe8cd44c89f05616b522c07d4.pdf?index=true
    • https://7fd672c9-0ac8-42d3-9d3c-9ebb2fbea2b4.filesusr.com/ugd/92785a_c9c571937be8427eacaf5f86f354fe7e.pdf?index=true
    • https://2571d5ef-7130-409a-b87d-c3fd18a83f30.filesusr.com/ugd/71fc55_6719defc8e9b4f59a8c0210e6bf519f1.pdf?index=true
    • https://7605c768-a471-4169-85a9-0dab509fd250.filesusr.com/ugd/20ab23_3a0bad8ef6f14ff8b7033cf18d159495.pdf?index=true
    • https://332892e0-6a2b-40ad-946e-e7c92c61c867.filesusr.com/ugd/3e5d97_87f33e703c874309ac44ca58f23f4011.pdf?index=true
    • 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_off0000f1ef.bin
fa96522131430ed32c0bceb223dee6976d0be1f8290513b4bb7086d15b9ff480		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EF 5300 bytes
font_01_sfnt_off000103ea.bin
390b8893e51bebe5958ac9c5def6f9c44815fa777e9eb6fdea51c8732ffead98		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103EA 11640 bytes
font_02_sfnt_off00012b1d.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B1D 4324 bytes

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