Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c235bdf1d5b21fe…

MALICIOUS

PDF

168.8 KB Created: 2021-01-01 18:58:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 8f78aba2c26b21ea44deca43260b9436 SHA-1: 070359ffe03c5324b0e4eca30422accd10a37342 SHA-256: 1c235bdf1d5b21febfcfca7abceccd0cbbecf86ef7b3c1e48ff6e74b0db31ac3
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded URLs and is flagged as a link farm on disposable hosting, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to direct users to the 'traffset.ru' domain for further exploitation. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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 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://traffset.ru/strik?utm_term=herpes+simplex+virus+infection+precautions PDF link annotation
    • https://putifunefam.weebly.com/uploads/1/3/0/7/130775131/winepegivemil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422135/normal_5f9dd1d4bee91.pdfIn PDF document text
    • https://rinalodejivew.weebly.com/uploads/1/3/4/3/134383373/vufedepoxaresiwafeka.pdfIn PDF document text
    • https://mulepulevuva.weebly.com/uploads/1/3/4/3/134366291/2b0f6e84e.pdfIn PDF document text
    • https://forunevelaviwa.weebly.com/uploads/1/3/4/3/134392474/2b5c4d69.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372373/normal_5fb97f60a378a.pdfIn PDF document text
    • https://xadajepiba.weebly.com/uploads/1/3/4/5/134589644/55b313b888d1c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473403/normal_5fbf6918a100c.pdfIn PDF document text
    • https://bafumujem.weebly.com/uploads/1/3/4/4/134498711/7367218.pdfIn PDF document text
    • https://fevowavekotaxuw.weebly.com/uploads/1/3/4/6/134635114/kekager.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/lonozote/85562768080.pdfIn PDF document text
    • https://s3.amazonaws.com/kotenu/fetiriworebesosu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e832a90-eba7-4870-afed-365e183c1456/gearwrench_torque_wrench_warranty.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00024e42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24E42 5132 bytes
SHA-256: 0b5b9a247ba52c064dd1af0ebe971668cda96f4a569da03b2098617c8588727e
font_01_sfnt_off00025f9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25F9F 11568 bytes
SHA-256: da10db4dfec6c3f6264f39be63d20e9b419635306a5921657e9e2648fcea381e
font_02_sfnt_off000286dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x286DD 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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