Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d1f9a97fe242553…

MALICIOUS

PDF

82.3 KB Created: 2021-09-22 14:15:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: cb2f7566f6ffae17ed8c633d4f4374ef SHA-1: 996b63b73306c2d40f37a57ccff7e84386faa8ee SHA-256: 9d1f9a97fe242553211deb6cb0a028f5f9e7f8b5af57b7fa59e977f553d02c3d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file 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 a deceptive download button, aiming to trick users into clicking through to external URLs. The presence of numerous unknown-reputation URLs suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://huntic.ru/uplcv?utm_term=android+viewer+mac PDF link annotation
    • http://netflor.pl/upload/File/vupenebigirife.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/fijizujuvi.pdfIn PDF document text
    • http://lovec.bg/root/ckfinder/userfiles/files/30496815619.pdfIn PDF document text
    • http://trips-in.com/ckupload/files/61247659336.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/xusuroxew.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/kudurodita.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/37539972452.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/42232791503.pdfIn PDF document text
    • https://morethancars.eu/uploads/edytor/file/721557176.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/72042215423.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/92057508820.pdfIn PDF document text
    • http://immobilier-valence-agen.com/userfiles/file/bugunusefe.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/fipenavurebawuzetazugu.pdfIn PDF document text
    • http://borisovhlebprom.by/var/upload/file/gofuvekelidim.pdfIn PDF document text
    • http://lecieldesandes.fr/ckfinder/userfiles/files/febafu.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/42935674029.pdfIn PDF document text
    • http://airsoft1.ro/files/file/zevavetiforuf.pdfIn PDF document text
    • http://lednotice.com/userData/board/file/93127248728.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614acab3ae7ee---61218527831.pdfIn PDF document text
    • http://trlgpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/11202739984.pdfIn PDF document text
    • http://goldendazzle.com/upload/quangtri/files/jogibimatepigut.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/26b7f95e09037080d5a25349ec6479ad/60365329170.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_off0000dc44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC44 10352 bytes
SHA-256: c1142318f5017d7cd5ce5b8586dca1d3da0890589c83e2c822d5a23b9b83f213
font_01_sfnt_off0000f3a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A9 18320 bytes
SHA-256: 1cbd1ac47b5e132c3be42f921b07d9760416475ecdd28c07828efec7f91bbf24
font_02_sfnt_off00012386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12386 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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