Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf4b6fcb23c229f2…

MALICIOUS

PDF

77.7 KB Created: 2021-03-31 19:12:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 1b2d865f927e3cda15e06c09cd460d63 SHA-1: 9118edb301dbf2d4fa827c3f864b0ba0b933ce44 SHA-256: cf4b6fcb23c229f2904d5ff4aed4d3af14c30a37925d76d05d5eee0190e42c6c
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://fokemale.ru/strik?utm_term=watch+20000+leagues+under+the+sea+full+movie+1954 PDF link annotation
    • https://xinefozi.weebly.com/uploads/1/3/0/7/130775465/734393.pdfIn PDF document text
    • https://cdn.sqhk.co/lokovipazal/GDiiX5B/13609621848.pdfIn PDF document text
    • https://cdn.sqhk.co/nevupediwix/Hii2fhb/tomonu.pdfIn PDF document text
    • http://detonic-italy.website/34012517958qdj73.pdfIn PDF document text
    • https://cdn.sqhk.co/mafowixodi/Aeia819/88950936910.pdfIn PDF document text
    • https://bezumovepefare.weebly.com/uploads/1/3/5/3/135337037/44f8659065fd237.pdfIn PDF document text
    • https://cdn.sqhk.co/zerurukoraju/goihhaA/japanese_abc_with_english_translation.pdfIn PDF document text
    • http://republvinb.fun/snake_in_the_grass_rap_lyricsb1vr4.pdfIn PDF document text
    • https://kofovozeregom.weebly.com/uploads/1/3/4/3/134313602/3254279.pdfIn PDF document text
    • https://wipiwabe.weebly.com/uploads/1/3/4/4/134438476/9104344.pdfIn PDF document text
    • https://tiparopodewab.weebly.com/uploads/1/3/5/3/135340776/rosele.pdfIn PDF document text
    • https://ladupizisegi.weebly.com/uploads/1/3/1/3/131380895/ruwek.pdfIn PDF document text
    • http://pixelbarista.com/50321944207t6kvh.pdfIn PDF document text
    • https://kazofinuso.weebly.com/uploads/1/3/4/3/134369681/812477ba191.pdfIn PDF document text
    • https://cdn.sqhk.co/jojevirelo/siigeeR/monster_car_race_apkpure.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/divelatoxa/kudototibozitadomig.pdfIn PDF document text
    • https://ebd73b9a-b255-48a5-b781-2bd84b483b4c.filesusr.com/ugd/956c05_245ad3e80bc64fba82eb2ea7e8d54169.pdf?index=trueIn PDF document text
    • https://ce3a146a-d504-4efb-981c-4593fb85d965.filesusr.com/ugd/5b5da7_dadc8da0a920406a86c586521d702900.pdf?index=trueIn PDF document text
    • https://1618b3f4-dcc0-4047-a816-eeb1cbe43c51.filesusr.com/ugd/a01749_ada871d7c8904ab4ab971e4b8b8726d5.pdf?index=trueIn PDF document text
    • https://9f9bd9fa-00fe-4673-b34e-9a629881f524.filesusr.com/ugd/09273f_0a834adebfad4c888299019ad2dc3391.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/woxorojero/jisum.pdfIn PDF document text
    • https://a9d1d3ec-13fa-4b7e-abe1-abe2c2ba1301.filesusr.com/ugd/f83029_a9cb5cb16f2546b9b0608fc462e2df7c.pdf?index=trueIn 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_off0000ef22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF22 6200 bytes
SHA-256: 1f6d81143fa105cd0d3ac09150630e11c4d3a3d000eae68a4bab4165243b0f8a
font_01_sfnt_off0001042f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1042F 10696 bytes
SHA-256: 039f52a221e931fa56295a8896b9adef6037abea267d3921577fe56253ebbed6

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