Malicious PDF — malware analysis report

Static analysis result for SHA-256 49e8e2d57fd157ff…

MALICIOUS

PDF

69.3 KB Created: 2021-01-08 13:54:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: cd1e7feb77dd3ed45a070db583ca97c4 SHA-1: 1ba4efa998ab3788b5f4988b99aa7a7afccd34cf SHA-256: 49e8e2d57fd157fff555da730a33368cef4b6f4840fc9075af564f09313d9fb6
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with one prominent URL pointing to a suspicious domain. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing or trojan variant. The presence of embedded URLs and the nature of the link farm suggest an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://trafffe.ru/aws?utm_term=autonics+le4s+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408703/normal_5fa73a0346256.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451971/normal_5feb340d22934.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366401/normal_5fa2d3115e913.pdfIn PDF document text
    • https://kinigapiluxuke.weebly.com/uploads/1/3/4/8/134863840/gerumogulexakonaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501791/normal_5fb8bc757d78a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366395/normal_5f8a0592240df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485445/normal_5fd8bd9222c73.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451350/normal_5ff64a8790ebd.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/fotojipifuzitul/noduzenesifezebu.pdfIn PDF document text
    • https://s3.amazonaws.com/rimejiguvif/1931367432.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/nobufilakeko.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_off0000c39f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC39F 4804 bytes
SHA-256: 4c08526083bc026c9ef6f616b3f791bde9bf33aa06b3707bb93fc582b6c838e2
font_01_sfnt_off0000d40f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD40F 11316 bytes
SHA-256: 920528ae52084881be9b4df01d843c2563090fa618c671b89f19ca4d97a381e5
font_02_sfnt_off0000facb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACB 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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