Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fafecfcc124ed74…

MALICIOUS

PDF

71.6 KB Created: 2021-03-23 11:37:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ffe2795dfafb12ed123cc168f2997ab SHA-1: b0c049347c74794df2a1a9753d0f7c0793e57b6f SHA-256: 6fafecfcc124ed7407ada1bc111d6363c92da2eaca48189c7ceba4f19636b6aa
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDFs, suggesting a link farm or redirection mechanism. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://botokaw.ru/strik?utm_term=understanding+multivariable+calculus+problems+solutions+and+tips+pdf
    • https://cdn.sqhk.co/keximovib/mGq7oje/56856749427.pdf
    • https://fekanarikivokil.weebly.com/uploads/1/3/4/8/134884633/6888ae2fbbb2.pdf
    • https://nidixinaxob.weebly.com/uploads/1/3/0/7/130739699/3005136.pdf
    • https://kuboteradaragi.weebly.com/uploads/1/3/1/4/131482952/fd62279c5570.pdf
    • https://cdn-cms.f-static.net/uploads/4493867/normal_5fdc7aaa922c9.pdf
    • https://cdn.sqhk.co/farosexuto/hJHz935/basic_drawing_tutorial.pdf
    • https://pananufizusa.weebly.com/uploads/1/3/4/4/134445813/1c2eddabb.pdf
    • https://cdn-cms.f-static.net/uploads/4446789/normal_60210fa1c3de6.pdf
    • https://lutijalejifepe.weebly.com/uploads/1/3/4/6/134649522/4481764.pdf
    • https://petizigosi.weebly.com/uploads/1/3/4/9/134903326/pixajezodadiro_pasavodomajakef.pdf
    • https://cdn.sqhk.co/wodabakope/QShhhie/equalizer_bass_booster_pro_1._4._4_apk.pdf
    • https://nupinegudoxaxu.weebly.com/uploads/1/3/5/3/135350485/juzugesap-vusuxapowu-nataveverazina-lewutebefogusox.pdf
    • http://safipewex.iblogger.org/50812139130.pdf
    • https://cdn.sqhk.co/zisubiziwu/bSggKgd/2838292309.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://c81c1a69-aec6-471c-ac34-7a6800eafc69.filesusr.com/ugd/9ef1ea_bd12bd3a1a9c48f39a8bf2082926dddc.pdf?index=true
    • https://9fbaa0db-fe9e-443e-b503-3d02ea494c21.filesusr.com/ugd/d417e9_11baf6cb83c541faa3d95abddeb91673.pdf?index=true
    • https://dc688580-c0ec-4ade-910b-7abffd870ab4.filesusr.com/ugd/096b61_bc95ad1f4c694f968995dd74f55ebd53.pdf?index=true
    • http://kazixovo.rf.gd/wowikiwaxekanuribijawux.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb46.bin
de643a2973df3900c618b9af5374a06744d562531a548a8cd5cae3da9f33e732		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB46 5548 bytes
font_01_sfnt_off0000de02.bin
56e323c4dd75eb220d27cb89123eef35631c2da5df66e6c644ae2ee0b557f710		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE02 10652 bytes
font_02_sfnt_off00010266.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10266 4324 bytes

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