Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf3171affc9beeb6…

MALICIOUS

PDF

71.1 KB Created: 2021-09-27 11:55:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 28228c27102337ae911f1170e9ada20c SHA-1: 20935f0818e2c35781a42d6ecaeb0420898ce031 SHA-256: bf3171affc9beeb6c26c19071c87217dc27bc8c57855505ce281ef364c23910f
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, many of which are part of a link farm hosted on disposable domains, indicating a likely attempt to redirect users to malicious sites. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document may be part of a multi-stage attack involving password-protected archives.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://laborke.ru/uplcv?utm_term=du+recorder+original PDF link annotation
    • http://xn----7sbabjlebzbdsbxti2bw3r.xn--p1ai/files/files/16642634004.pdfIn PDF document text
    • http://peter-scherer.de/userfiles/file/pimititewikusugokaxol.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/baguzubi.pdfIn PDF document text
    • https://ahl2005.com/ckfinder/userfiles/files/xipup.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/dagezotaxobewe.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614f1a6e64151---99651245397.pdfIn PDF document text
    • http://noithattamphuong.com/upload/files/fukogilutoraromupasoge.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/80781202316.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/14013266403.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/baniv.pdfIn PDF document text
    • https://ozsersogutma.com/upload/files/mitotidatotunibubunajama.pdfIn PDF document text
    • http://metisentry.net/ckfinder/userfiles/files/96157901527.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/norux.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/7098123128.pdfIn PDF document text
    • http://ydis.kr/userfiles/file/081436183496.pdfIn PDF document text
    • https://jung-yeunjang.ch/userfiles/file/16135157817.pdfIn PDF document text
    • http://itcck.org/upload/editor/file/48410462125.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/65707390423.pdfIn PDF document text
    • https://ducthai.vn/userfiles/file/wugugopimiwesizeto.pdfIn PDF document text
    • https://imihwa.com/uploads/image/20210921/files/20210921175408.pdfIn PDF document text
    • http://amy-tsai.com/images_express/userfiles/files/bunurofosi.pdfIn PDF document text
    • http://chia4kids.ru/ckfinder/userfiles/files/nelizorexavenal.pdfIn PDF document text
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/xudejezanawewilozotonite.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://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_off0000b1ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1EE 10380 bytes
SHA-256: 5dd2b52fb57ddc7a632c787e0970cf28e33d4a61aef6fa3f12fd6562b4664f09
font_01_sfnt_off0000c937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC937 17492 bytes
SHA-256: 973ffe2aaef47d89ba5b239262e51b6c1f40bac90511bed3af8160b6a3d4fac6
font_02_sfnt_off0000f681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF681 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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