Malicious PDF — malware analysis report

Static analysis result for SHA-256 c293df8ac3eaba2d…

MALICIOUS

PDF

74.9 KB Created: 2021-02-06 20:08:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 220cc3792db969e3b995da46132aa5be SHA-1: 404baded6f20388bcc5e02be9d6405844ecc32b9 SHA-256: c293df8ac3eaba2d112281845b4b656bd40de09404811a07219c8c0d3bd0ed16
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains multiple embedded URLs, including one pointing to 'bologen.ru', suggesting it's part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, appears to contain text related to a traffic report, likely a lure to encourage users to click the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/aws?utm_term=san+diego+freeway+traffic+report PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4372983/normal_5ffa5bd070150.pdfIn PDF document text
    • http://kayikciakademi.com/yahoo_email_app_apki7gxv.pdfIn PDF document text
    • https://sezebotari.weebly.com/uploads/1/3/1/6/131636698/napokaj-nabakugil-davejotobu-vonejewuva.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479673/normal_5fd9bd48173bc.pdfIn PDF document text
    • https://vogavowaxataner.weebly.com/uploads/1/3/4/2/134266619/3b74c5.pdfIn PDF document text
    • https://fereganew.weebly.com/uploads/1/3/4/1/134131887/tebakugub_rosogiwazesewem.pdfIn PDF document text
    • https://dijavagom.weebly.com/uploads/1/3/5/3/135325372/3614a0f66002.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497697/normal_5ff7cd717aa9e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391602/normal_5fe3cd03f064d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448986/normal_600e0fd8ae56f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366645/normal_5fe58fa839ee5.pdfIn PDF document text
    • https://cdn.sqhk.co/rebamomidaw/37hjNji/oneplus_care_plan.pdfIn PDF document text
    • http://linza.media/jt_101_post_test_1_answersod488.pdfIn PDF document text
    • http://prod-fruit.space/twrp_3._1._1-_0i7rx0.pdfIn PDF document text
    • https://pasojifet.weebly.com/uploads/1/3/0/7/130776368/wubave.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE588 5408 bytes
SHA-256: f4a796b82c8180878317a17fbf8b1a5f5e8bb6538a95a3aac823a33e3dffa600
font_01_sfnt_off0000f81d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81D 11476 bytes
SHA-256: b541f1287b11c779b5cbb845c3e5f4517fe085743854de8bcd2443e89bb07d4b

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