Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb61f333bd01b9f5…

MALICIOUS

PDF

70.0 KB Created: 2020-12-03 08:41:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 510fba352bc2bdfdbcbad6afdff667a6 SHA-1: 9ec955d3b10e2e2fda5f399b04de3b626f128b1b SHA-256: fb61f333bd01b9f5ba16a2a32b05a86a4ef52f39dbdfd8844a5010c75c852469
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to PDF files, suggesting a link farm or content aggregation strategy. The primary embedded URL, 'https://traffset.ru/123?utm_term=industrial+revolution+vocabulary+crossword+answer+key', is presented as a crossword answer key, a common lure for phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the distribution of malicious links.

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://traffset.ru/123?utm_term=industrial+revolution+vocabulary+crossword+answer+key PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4484993/normal_5fad5916ad541.pdfIn PDF document text
    • https://molipose.weebly.com/uploads/1/3/4/6/134644393/102e52f61.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492593/normal_5fbcb9db74f51.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419194/normal_5f9f3b22b39d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414489/normal_5fb830c8aa15f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370778/normal_5fa46f0e985be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425217/normal_5faefebed9425.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/jezekemunidup/bathukamma_songs_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/wutezigojuxi/my_hero_academia_episode_36_dub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17f0b971-eb00-488e-9303-7060108144ba/kipezufafoxusezalovufado.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaporam/edhesive_2._8_code_practice_answers.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_off0000c54a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC54A 5212 bytes
SHA-256: a5d1da9fbc3a4caf7faeaefc2ffbfd4934e3db33556d9c91b488b94de31a012d
font_01_sfnt_off0000d71d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD71D 10816 bytes
SHA-256: 42fa3a71b06e4b810c18d4040a5a2c9e92fc52ed3add4cb092cef888a94ef615
font_02_sfnt_off0000fac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC2 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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