Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9b02bd3be377f16…

MALICIOUS

PDF

64.2 KB Created: 2021-02-13 12:15:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: a7c76760ef3a16afa14a9f4f68c45b9d SHA-1: 4bbb3464bb665576c86948cebb28d19e51227841 SHA-256: b9b02bd3be377f1699c04a3aae8b0769e15432d8921462c3e0bb87d202ad613f
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external URIs, many pointing to disposable hosting and employing UTM parameters, suggests a link farm designed to redirect users to potentially malicious content. The document body, though heavily obfuscated, contains metadata related to PDF creation and potentially misleading content, further supporting a phishing or malware distribution lure.

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://druttle.ru/aws?utm_term=lego+architecture+studio+book+pdf PDF link annotation
    • https://zomerasojukoluw.weebly.com/uploads/1/3/4/7/134769652/c440c.pdfIn PDF document text
    • http://the-glow.ru/acceptance_letter_hogwartsvvb7h.pdfIn PDF document text
    • http://tehnotop.space/11140794498nche1.pdfIn PDF document text
    • https://cdn.sqhk.co/vipujitebiki/cDuidIq/little_alchemy_2_life_cheats.pdfIn PDF document text
    • https://cdn.sqhk.co/nezafomura/RDnG35s/f_stop_gallery_pro_paid_apk.pdfIn PDF document text
    • http://tortomsk.ru/654362285244bb3e.pdfIn PDF document text
    • https://fereganew.weebly.com/uploads/1/3/4/1/134131887/1689501.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419849/normal_601db2fec11a1.pdfIn PDF document text
    • http://digozulujatozuj.iblogger.org/simbol_flowchart_lengkap.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365582/normal_5fc5be692c1eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481985/normal_6020989f11c3e.pdfIn PDF document text
    • http://topstudy.fun/business_administration_degree_jobs_listv87t2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409826/normal_5fce73489cb5a.pdfIn PDF document text
    • http://gsmall.space/wadali_brothers_audio_songs_free89iqa.pdfIn PDF document text
    • https://cdn.sqhk.co/kugugofawaz/eqjbhia/radiant_heat_panels_ceiling.pdfIn PDF document text
    • http://letuxegesilem.iblogger.org/komaluzedumozererib.pdfIn PDF document text
    • http://teachost.com/seperiporixelosexiaipyb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nimoxorud.epizy.com/69831700001.pdfIn PDF document text
    • http://riremeg.rf.gd/escape_room_level_48_answer_mystery_word.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_off0000bfcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFCB 5528 bytes
SHA-256: f195c2fd97e34f75b11f4965a871f7e022edd52824ceb630c3e5f780d62e8d2d
font_01_sfnt_off0000d294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD294 9560 bytes
SHA-256: 04dc90888b918d74fbe84520633e07db0e8ac8cd959a78f0b058d0b7a693fc8a

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