Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5845d9087ff38b6…

MALICIOUS

PDF

69.6 KB Created: 2021-10-01 15:42:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d10656f67c74d14dbd4d991811a68d2f SHA-1: 4c4a35ba604df01a19e7e8dbc832829e0211e9ab SHA-256: a5845d9087ff38b6d45a1cc811d6748a67d81e6b171c535f1bb3d60232b5bf41
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to suspicious domains, and one heuristic identified it as a link farm on disposable hosting. While no scripts were explicitly extracted, the nature of the embedded URLs and the detection as a phishing trojan suggest an intent to redirect users to malicious sites for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://wpchkg.com/upload/image/file/mofebadapedibozinufi.pdf In PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/85883549815.pdfIn PDF document text
    • http://sentidoseg.com/resources/original/file/96703108142.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/fadumowelavu.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/33340261941.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/4808412533.pdfIn PDF document text
    • http://szerecsen.hu/editor_up/zovuwijivavijud.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/regabemanelumowiwibu.pdfIn PDF document text
    • https://rgcsmt.org/ckfinder/userfiles/files/94291262198.pdfIn PDF document text
    • http://greensquares.in/userfiles/file///mawifobugedutag.pdfIn PDF document text
    • http://edeins.com/userfiles/file/duxitonovafi.pdfIn PDF document text
    • https://groupburuemas2.com/contents/files/33230850380.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/xibepep.pdfIn PDF document text
    • https://suacuachuyennghiep.com/uploads/files/gisekubakedadoxipo.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/94217155209.pdfIn PDF document text
    • http://rybarict.cz/webpagebuilder/ckfinder/userfiles/files/74484835546.pdfIn PDF document text
    • https://perfecthospital.net/FCKeditor/file/jafazifevoji.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/sijirafukojebewagetisodij.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/8639937359.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/fikewiketoketizogugejetap.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/mujalelonibewugekava.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=learn+to+create+a+local+multiplayer+game+in+unityPDF 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_off0000afbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D3 10720 bytes
SHA-256: 41d3ea1a2e65f5c44196c05771f1a903730ce68f76422e454c27a49a228e4596
font_02_sfnt_off0000e069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE069 15856 bytes
SHA-256: 00a2297b7c2af6de08181ba82bea5ce55ae1256076c776f89ead8313bbbc3655

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