Malicious PDF — malware analysis report

Static analysis result for SHA-256 d36c53075013a72e…

MALICIOUS

PDF

80.1 KB Created: 2021-03-25 18:00:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: e2add83621e7909c0fa4758bbbbcafb4 SHA-1: 71bb48a17733ada4360b862491ef56d3836f0bcb SHA-256: d36c53075013a72eaf03684eb9cae72a7d000e857b3e0d6268f0b303ee6d852d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of external URIs and a link farm heuristic suggests the document is designed to redirect users to potentially harmful websites. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme.

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://pelibifir.ru/strik?utm_term=fruits+with+high+calories+to+gain+weight PDF link annotation
    • http://zenajok.medianewsonline.com/simple_past_and_past_participle_exercises.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495855/normal_5fcf295f8c65d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497697/normal_5ff630cc44891.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451940/normal_601933efe132a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403681/normal_5fd79f900d229.pdfIn PDF document text
    • http://fosupaxutipiz.iblogger.org/manual_de_organizacion_y_funciones_comisaria_pnp.pdfIn PDF document text
    • http://pedosapabosa.iblogger.org/el_conde_lucanor_anaya.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366317/normal_6055288a98860.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409814/normal_602a1b87f2308.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cee4a208-09ac-40e0-983f-4c2cc776acbe.filesusr.com/ugd/5ed537_9f2f88c7116840bcac0a2a0a735dc472.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0f1d4d7-c24d-40a6-8e17-111eeefb14fc/whats_in_the_night_sky_tonight_app.pdfIn PDF document text
    • http://nununad.myartsonline.com/duxule.pdfIn PDF document text
    • https://9de673a2-3b8e-40eb-bbf5-c0ad8e71a3da.filesusr.com/ugd/bd5c68_7ff920f80b3a4465a0ea7104361d4b71.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/77216a50-004a-46ac-8c4e-f58723868e1b/why_netgear_wireless_is_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/092a7f6f-0ec7-4828-aca7-61909ef3bba8/how_to_turn_speaker_off_on_ipad.pdfIn PDF document text
    • http://wukevivetarapu.myartsonline.com/acidoctose_diabtique_traitement_protocole.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D7 5108 bytes
SHA-256: bd2f701855c608c740d6f8ad34313388425a7a46e8c8d7eacd4639d4d27ff9bc
font_01_sfnt_off00010b4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4E 11296 bytes
SHA-256: 3b5c1aee60664c51a8193e360fda9bb9f97be780d5290dbdce7cd4a1a717c8cb

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