Malicious PDF — malware analysis report

Static analysis result for SHA-256 da95f179bc910785…

MALICIOUS

PDF

75.4 KB Created: 2021-01-06 06:22:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 2cf278424bb9c930a71ed71d0e29859b SHA-1: eee18c60e05df4b0bd5254fdb369350fedc34d3d SHA-256: da95f179bc9107853462df0fed805aae7bb3a1ba3e5ecffd97b31004d41ee3c6
126 Risk Score

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. Heuristics indicate it functions as a link farm, directing users to multiple disposable domains, with a prominent external URI pointing to 'trafffe.ru'. The document body, though heavily obfuscated, contains references to movie songs and application metadata, likely serving as a lure.

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://trafffe.ru/aws?utm_term=aaru+movie+songs++starmusiq PDF link annotation
    • https://nukawopuriw.weebly.com/uploads/1/3/4/3/134347541/85c86b1e2.pdfIn PDF document text
    • https://cdn.sqhk.co/jasorevujoxu/MyijfLc/94183515397.pdfIn PDF document text
    • https://sozufozixukuba.weebly.com/uploads/1/3/4/7/134730132/buxepafu.pdfIn PDF document text
    • https://cdn.sqhk.co/zipirevofu/gclgija/13917667188.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475572/normal_5fddafbeb3552.pdfIn PDF document text
    • https://cdn.sqhk.co/ralapogifur/lie9yX3/fake_caller_id_number_prank_calls.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427287/normal_5fa3960855b8e.pdfIn PDF document text
    • https://kudowelevuk.weebly.com/uploads/1/3/4/5/134585456/mipup_lolesiwekija.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/81ba26c5-5200-4121-84be-aff7d15f2592/tagezov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d16fc67-f00b-4481-9d83-955170b733d3/gakutem.pdfIn PDF document text
    • https://s3.amazonaws.com/rogugagatuf/46221290146.pdfIn PDF document text
    • https://s3.amazonaws.com/sisaxu/68248865474.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_off0000e9b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B9 5148 bytes
SHA-256: 55ed6e6f954b50ba614d3d61025f870361ee75a06b6a61360170889519c88342
font_01_sfnt_off0000fb2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2F 11232 bytes
SHA-256: d917eab0d646f09e4ffc7275a4cbfad8d01f0802f9ae6e921d3a98d1a78bc137

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