Malicious PDF — malware analysis report

Static analysis result for SHA-256 10fd2cb6d59f1424…

MALICIOUS

PDF

68.6 KB Created: 2021-02-21 16:50:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 62707b2b3db3861f48d821c8fee05937 SHA-1: 2db55bcd5cf2d853c847ca0381f0acc818f81c06 SHA-256: 10fd2cb6d59f142424c32141691cd1ff4b15f9d72ab3f20ea5278d831ccb140a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or redirection mechanism. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate an attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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/strik?utm_term=nutrition+facts+taco+bell+spicy+tostada PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370996/normal_602e1017789df.pdfIn PDF document text
    • http://moresukko.ru/salisivcs52z.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463538/normal_60120a5db3818.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449615/normal_5ffdd32a0ec0b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365649/normal_601cb9fde7b48.pdfIn PDF document text
    • http://dithetsen.xyz/dell_precision_t7500_price_in_pakistan03fdp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369487/normal_602639721d0d3.pdfIn PDF document text
    • http://igafnd.org/nifarofibunesuxs3uqb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388819/normal_600e85d763069.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473890/normal_5fda6618a03ac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386828/normal_5fe17fedd469e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373505/normal_6020d7f9a082d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376380/normal_60262a9d44b8d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wimosatemegof.rf.gd/peter_carroll_liber_kaos_espaol.pdfIn PDF document text
    • http://nifibomagogov.rf.gd/vinidex_catalogue.pdfIn PDF document text
    • http://tivekanudoz.rf.gd/refusidumopuvi.pdfIn PDF document text
    • https://s3.amazonaws.com/guxosa/mirotoru.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF28 5360 bytes
SHA-256: 90a62d4edf652aa8bf8e5556cdfc670ec47b96ec0704c004bb495fc570277607
font_01_sfnt_off0000e178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE178 10392 bytes
SHA-256: ede92ba1806efc92147b3a968189bcabaa481b9f145656cff7439ee11cd3c82c

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