Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4f0728ecb257885…

MALICIOUS

PDF

83.1 KB Created: 2021-04-02 21:31:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 12b8df12019d3f2d96e3fd091d6f9733 SHA-1: 21a94761c020b6c674ebe4d16b77a4addfb5224b SHA-256: c4f0728ecb2578851b791ec9f081fdee6fe3fb1ad152672d20adda619e57da33
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous external URLs, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though partially corrupted, references 'Aoac methods of food analysis pdf', likely a lure to disguise the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://resalured.ru/award?keyword=aoac+methods+of+food+analysis+pdf PDF link annotation
    • https://femuketidoxesi.weebly.com/uploads/1/3/3/9/133997502/xagururabajogak.pdfIn PDF document text
    • http://internet-babki.ru/galanodopekuwiw528j.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450044/normal_601137b1e7622.pdfIn PDF document text
    • http://kenugizi.getenjoyment.net/bugsy_malone_song_lyrics.pdfIn PDF document text
    • http://afracheat5.xyz/wijaxatagibepotiriwipobkini.pdfIn PDF document text
    • http://kirazoki.22web.org/catholic_bible_timeline.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375704/normal_600fc7af1d8df.pdfIn PDF document text
    • http://xowefew.22web.org/oxigenoterapia_de_alto_flujo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469351/normal_602cf2c35be9a.pdfIn PDF document text
    • http://artdebug.site/ropofisf9ruw.pdfIn PDF document text
    • http://artelamp.store/ping_pong_rules_game_to_210gqc6.pdfIn PDF document text
    • http://maxiteguf.medianewsonline.com/admin_staff_job_description.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478928/normal_6021d26637385.pdfIn PDF document text
    • https://mobisikude.weebly.com/uploads/1/3/1/6/131606420/6710183.pdfIn PDF document text
    • http://50offstore.info/72559773253a9tb1.pdfIn PDF document text
    • https://bawidonawasaz.weebly.com/uploads/1/3/4/3/134354070/72c5fa.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/3d00e73e-c413-4924-a9ad-b41dc66d5f4c/how_to_repair_sony_trinitron_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9633f18-1461-492b-81ce-8207bcf7aff8/26914100305.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0832d6d7-218b-4a0a-a678-619dd76f901d/reliable_hotel_booking_sites_in_india.pdfIn PDF document text
    • http://sumawimibodi.rf.gd/wavejugenasel.pdfIn PDF document text
    • http://pobevejilu.rf.gd/gotuxozizupitegil.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_off0001077e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1077E 5392 bytes
SHA-256: 68b2e08cfb31e3bf7393d940263368288b53b21e82a546ea60f2fea80d7d496b
font_01_sfnt_off000119c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C1 11304 bytes
SHA-256: 47ec485f7094da7505aa6591bdafb07f67986cd117ff40abe388564bf1f5faee

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