Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac3d858e66baff7e…

MALICIOUS

PDF

68.9 KB Created: 2021-09-29 14:23:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 9718453cb5d0e31e64751cd43e920b90 SHA-1: 1aa9c3d27650e1985d3845775bf058af782671bf SHA-256: ac3d858e66baff7ef6760a3aae6c8d782babe7babe187dd91a62287b24b61614
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 identified as phishing or a trojan. It contains numerous embedded URIs and links, suggesting an attempt to redirect users to malicious sites for further exploitation. The presence of multiple external URIs and a link farm heuristic indicates a strong likelihood of this document being used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • 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://archism.ru/uplcv?utm_term=how+to+blur+background+image+in+android PDF link annotation
    • http://fapannimario.it/userfiles/files/dajofejefi.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/funowatewipefolujurup.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137446701c23---73896893457.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/94188277982.pdfIn PDF document text
    • http://julianina.de/upload/file/wiguxofupobozodaxagozobi.pdfIn PDF document text
    • http://dakov.hu/_user/file/76922735050.pdfIn PDF document text
    • http://dungcucaytrong.com/images/files/96065143046.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/totuxuxifegesejevuxabanu.pdfIn PDF document text
    • http://markfarolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/22582410226.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/71721194423.pdfIn PDF document text
    • https://abyway.lv/images/ck_images/files/lubevurikuviremikip.pdfIn PDF document text
    • http://elitacasa.it/images/file/zedifefazokiduwaxodixusan.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/vuvinozuduja.pdfIn PDF document text
    • http://abwsalisbury.com/uploads/files/37952310581.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/87337794326.pdfIn PDF document text
    • https://artenika.pl/fck/file/19336401972.pdfIn PDF document text
    • https://mimpidia2.com/contents/files/63769802761.pdfIn PDF document text
    • http://plenaseguroseprevidencia.com/fotosempresa/files/38100888459.pdfIn PDF document text
    • http://entrackintl.com/uploads/89228137626.pdfIn PDF document text
    • https://fultoys.com/userfiles/vevofisudasigagadiwelox.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_off0000ae01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE01 15336 bytes
SHA-256: e84be03ce0b6ac15eb36b01727ad6a696498d1d2f91e5fe4e97abc522ae160d3
font_01_sfnt_off0000d4c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ecda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDA 10952 bytes
SHA-256: dcc5a5f5604371e65a48664eb7ea8975409d9e3a3257ee435809399b8d90fb38

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