Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe6f0fc13795f2b6…

MALICIOUS

PDF

73.7 KB Created: 2021-09-28 15:44:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 40844f30d1d4e9f5eb4a76e222aa44a1 SHA-1: e4b8016953af0c9f377038a785cc9fa335a8181f SHA-256: fe6f0fc13795f2b6dbafb983b47224f3b92727d89df28fb6530f12545effc374
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, indicating a link farm designed to redirect users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirms this behavior, suggesting the document's primary purpose is to distribute malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://infrive.ru/uplcv?utm_term=how+to+record+pubg+mobile+gameplay+with+internal+audio+on+android PDF link annotation
    • https://alohasafaris.com/files/53390927373.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/desem.pdfIn PDF document text
    • http://apsons.eu/files/file/mozebufixupelosokunuzulol.pdfIn PDF document text
    • http://altinay-law.com/images/file/donojoxateniful.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210901121625761.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/lulusalitujanudej.pdfIn PDF document text
    • https://petandpuppies.com/userfiles/file/22302812539.pdfIn PDF document text
    • https://checkmavandon.com/asset/site/files/68138399639.pdfIn PDF document text
    • http://studioarchterreni.it/userfiles/files/320498971.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1614804c9bc858---nalonatux.pdfIn PDF document text
    • http://patchworkstudio.de/userfiles/file/napezukoxawape.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/rukasidawotirukimodox.pdfIn PDF document text
    • http://plaschke-partner.com/uploaded/file/zafozajalapose.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/jakazigakox.pdfIn PDF document text
    • https://buzascsaba.hu/userFiles/file/72150977188.pdfIn PDF document text
    • http://loaamtran.com/files/usersfiles/files/18420140537.pdfIn PDF document text
    • http://labsshop.com/d/files/nezilajiragomajemaramulo.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/vivew.pdfIn PDF document text
    • http://vinabomi.com/uploads/userfiles/file/nixexoralu.pdfIn PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/69471461836.pdfIn PDF document text
    • http://davidhammerstein.org/ckfinder/userfiles/files/xobujowidofolol.pdfIn PDF document text
    • http://interstyle.org/content/xuploadimages/file/45153004899.pdfIn PDF document text
    • http://staceyasp.com/UserFiles/file/50243941433.pdfIn PDF document text
    • https://inprovitcentroamerica.com/ckfinder/userfiles/files/98761924033.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_off0000b53d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB53D 18416 bytes
SHA-256: c82abe4adc5ad11ebddfad0f013f8e43ca908754718b96a9260db6f3a276ac18
font_01_sfnt_off0000e48b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA2 11224 bytes
SHA-256: 58d0e4b8af20d5cff0060b1f4efadc2cbb68554ef14a3fb667bb58e3e88dc53f