Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3f4c6ffe30f8cf8…

MALICIOUS

PDF

76.4 KB Created: 2020-11-11 20:48:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: edce6ad7feb65fc3a09b4c8a5695b4a6 SHA-1: ebe875af8485627ea5d29ad21c656473efa9be25 SHA-256: a3f4c6ffe30f8cf84a209ea19807fedd4e031c48e4956745fe2f7af365ca30c2
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one critical heuristic firing indicating a redirect to known malicious infrastructure. Another critical heuristic identified a large number of external PDF links, suggesting a link farm. The ML classifier and ClamAV also flagged the file as malicious, supporting a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffine.ru/strik?utm_term=ccta+bus+schedule+north+ave In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366405/normal_5f88f9cf29cd2.pdfIn PDF document text
    • https://mefemanodi.weebly.com/uploads/1/3/1/4/131454269/sivovawi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366952/normal_5f872a35cc5a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380528/normal_5fabeeaa37cca.pdfIn PDF document text
    • https://jenititufevi.weebly.com/uploads/1/3/4/5/134595561/4487544.pdfIn PDF document text
    • https://setisobizosepi.weebly.com/uploads/1/3/4/6/134670504/3528423.pdfIn PDF document text
    • https://vikumeniwexawud.weebly.com/uploads/1/3/0/9/130969440/d585eab8343c0.pdfIn PDF document text
    • https://sesuwulot.weebly.com/uploads/1/3/1/4/131438847/rubakomeliw_pobonefe_wiwos_wamogabenu.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/gafedupeba/towimigovumagugexogot.pdfIn PDF document text
    • https://s3.amazonaws.com/peveziwoguxuzam/warble_crossword_puzzle_clue.pdfIn PDF document text
    • https://s3.amazonaws.com/sefukirexuwekij/xizemutamipafuvijorawe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb2a6743-906c-4c10-8a9e-47e736d90e29/92659313162.pdfIn PDF document text
    • https://s3.amazonaws.com/gogoxowiniza/97496090101.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000be27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE27 7496 bytes
SHA-256: c807b03e523d5c259f66c25a576b81f0b0240abbbf6a7934b42c945685cd372b
font_01_sfnt_off0000d77e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD77E 5132 bytes
SHA-256: f6ca307704363a548c0ae691f5b7040a4842c3bbf373ca6b5af109ce03e41358
font_02_sfnt_off0000e8e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E7 10992 bytes
SHA-256: 91a2abfec4197bf244fceaf0f175894e3315f9c22b9dceb832039ecba8e37148
font_03_sfnt_off00010e19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E19 16036 bytes
SHA-256: 35d3440dae1ebc896564e4e6f70ea95aa3a30a1ac603c7fffbb21b68b8b72e2f

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