Malicious PDF — malware analysis report

Static analysis result for SHA-256 de7fe8bf5907f00d…

MALICIOUS

PDF

72.5 KB Created: 2021-02-11 23:46:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: a4affee86805a75050bd9e4647106082 SHA-1: 9cb6c2fa004304a900a4c2eafe882b759bd98ecb SHA-256: de7fe8bf5907f00deb6af75e2138a002fc96b10e3835206fff5ec4236acbe910
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. It contains multiple external URIs, including one that masquerades as a 'kitchenaid stand mixer troubleshooting manual' and points to a suspicious domain. The presence of numerous links on disposable hosting further supports a malicious intent, likely to redirect users to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/wix?keyword=kitchenaid+stand+mixer+troubleshooting+manual PDF link annotation
    • http://afracheat3.xyz/277592958184r2wc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495241/normal_5fd2df83a66db.pdfIn PDF document text
    • http://probmaka.tech/28434203789u1zi0.pdfIn PDF document text
    • http://italysummer.space/61069756779m02h6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501660/normal_5fe43deb3e918.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444096/normal_5fd317ad8e952.pdfIn PDF document text
    • http://klosheff.xyz/slimming_world_food_diary_templatecnwst.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453100/normal_5ffea7ad7a847.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388818/normal_6012bc412be36.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369777/normal_5ff876ada110f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473052/normal_5febe10a49210.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393625/normal_5fd6538f49970.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/potamotaz/corrugated_roofing_sheets_anti_condensation.pdfIn PDF document text
    • http://fomobiwudaz.rf.gd/67604935338.pdfIn PDF document text
    • https://s3.amazonaws.com/lizuseguwix/kohima_weather_report_tomorrow.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_off0000deae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAE 5528 bytes
SHA-256: 006f1b75183f55abc94e9918d103ccc24c97405b817d07e2b2a9845cf5d3e98a
font_01_sfnt_off0000f154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF154 10332 bytes
SHA-256: 247142325bdd79cab23a3cc813a3d778acb4a95039b030c4f47b0d123c08e6c6

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