Malicious PDF — malware analysis report

Static analysis result for SHA-256 faadd7ffbc9a64f8…

MALICIOUS

PDF

75.9 KB Created: 2021-04-01 08:49:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 1c8fac35c72eb456c78b2cd018196b19 SHA-1: e4be9e8d94282e92d5ae8dcd90dca7c085d36763 SHA-256: faadd7ffbc9a64f875117326e9a05ab6fa47631b69d047109ad8a3486615bf8e
126 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. The embedded URLs and the PDF structure suggest an attempt to redirect users to potentially malicious content, aligning with phishing or malware distribution tactics. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious intent.

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://jumiwimov.ru/award?keyword=html+to+pdf+javascript+react PDF link annotation
    • http://manamuketamas.22web.org/intention_to_vacate_template.pdfIn PDF document text
    • http://lovepositions.info/rinnai_rur98i_parts_diagramh0bz7.pdfIn PDF document text
    • http://voicebftyi.com/67923781374qb5jg.pdfIn PDF document text
    • http://podarokinsta.site/profiles_in_courage_chapter_1b1k4r.pdfIn PDF document text
    • http://zhenskiizhurnal.ru/armitron_digital_watch_change_from_military_time510l4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zazaluvuzusu.rf.gd/20518183484.pdfIn PDF document text
    • https://s3.amazonaws.com/popilo/nekuromezelila.pdfIn PDF document text
    • http://pupovedifa.rf.gd/bowlers_journal_ball_guide_2018.pdfIn PDF document text
    • http://tawenaxogiminax.epizy.com/younow_apk_mod.pdfIn PDF document text
    • http://majexubul.rf.gd/silixizode.pdfIn PDF document text
    • http://fanifejufego.rf.gd/how_much_does_a_jotul_602_cost.pdfIn PDF document text
    • https://f37c3615-20b0-4e70-b1e7-2acf34113780.filesusr.com/ugd/1e533a_359f4e9fba7b4563a3011c90aad1f1f4.pdf?index=trueIn PDF document text
    • https://1a6defe7-92a0-4357-8a70-d3bce85d30c9.filesusr.com/ugd/385065_c071d075665a4351bc99a6a7b6b8ad94.pdf?index=trueIn PDF document text
    • http://tasaronusofake.rf.gd/39440023374.pdfIn PDF document text
    • http://muvalinifotu.rf.gd/57110820182.pdfIn PDF document text
    • https://s3.amazonaws.com/wovisak/galalu.pdfIn PDF document text
    • http://buguwotibiven.rf.gd/infographics_resume_templates_free.pdfIn PDF document text
    • https://91ca87c2-c493-4616-adaa-fbcec45394e1.filesusr.com/ugd/6116da_687635dc9ff3458abb7282799e36a11a.pdf?index=trueIn PDF document text
    • http://jeragoka.rf.gd/how_much_is_the_new_jersey_transit_bus_fare.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_off0000e848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE848 5396 bytes
SHA-256: c322bad1a15b9088a868aa4e817173d70b232ea5968c138e0c2cecaf6d283979
font_01_sfnt_off0000fa9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9F 11920 bytes
SHA-256: ef08ebd9cb5f40de8d7cc8d4d416f98a5b1af709312001f9f069e4ec30826067

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