Malicious PDF — malware analysis report

Static analysis result for SHA-256 61dee7a6c3cf9a3b…

MALICIOUS

PDF

72.5 KB Created: 2021-09-17 03:05:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b644a5671f042116490ffe523dd7a962 SHA-1: a2dc3bdabdfb68030567e71b56015fedb93f9519 SHA-256: 61dee7a6c3cf9a3b2d0905991972ceaca4b0ca4302202d6824f5fc01e457c942
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to disposable domains, likely intended to redirect users to malicious sites. The `wkhtmltopdf` authoring application suggests it may have been generated programmatically for this purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://kalikraft.com/images/file/bazomobomezakigom.pdf In PDF document text
    • https://incoyun.com/calisma2/files/uploads/82725922352.pdfIn PDF document text
    • http://3q1p.com/upload/file/210908051535400127vzlzowy26483.pdfIn PDF document text
    • http://yejiya.com/userfiles/file/lunovusiti.pdfIn PDF document text
    • http://spartapr.com/images/upload/file/41432830129.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef96ee3bd5---33557616305.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/wiwamixanevil.pdfIn PDF document text
    • https://hinodecoder.com/userfiles/file/40445292556.pdfIn PDF document text
    • http://sinice-rasy.cz/files/file/fuvuli.pdfIn PDF document text
    • http://www.mattig-accounting.bg/fisiere/file/rofudidud.pdfIn PDF document text
    • http://agrihitech.net/media/ftp/file/4117220382.pdfIn PDF document text
    • https://mmgrowersg.com/ckfinder/userfiles/files/dugigawotikibozexuv.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/xojegozanesiso.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/redarubijube.pdfIn PDF document text
    • http://tnshoppingbag.com/upfiles/file/94481970282.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/zowidak.pdfIn PDF document text
    • https://wita.lt/images/files/sisekabaretafoxufopak.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/57323948856.pdfIn PDF document text
    • http://koutingchina.com/upload/files/kadejobebuxirebegedu.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/69509175393.pdfIn PDF document text
    • https://trieurodata.ro/images/file/89141549831.pdfIn PDF document text
    • http://zhatuogz.com/uploadfile/file/xukagutidulijuzasonubu.pdfIn PDF document text
    • https://tp-pos.com/uploads/image/files/70297418939.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=michat+lite+apkPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b8c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0DD 10064 bytes
SHA-256: 01f1619ddaaf378afe8be69aa6a7b02cc8ab93eced70816a48086c42787f0cd6
font_02_sfnt_off0000e767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE767 17420 bytes
SHA-256: 3405da22bb72bcef6b13c00ace64d0bbfa3f9bcaba07921d91f29c28d69c3787

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