Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f33cfd2543c5718…

MALICIOUS

PDF

74.4 KB Created: 2021-10-20 01:21:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: aa0af1b3259be9a6d9c7a36db22bfeef SHA-1: 32dce51af72d97c6988b7a38e5d2868fff61dfe4 SHA-256: 7f33cfd2543c5718dd0a9a711e5af6f5b95182f8f718ef72c343131cc864e156
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of embedded URLs, many pointing to unknown domains, and is flagged as a link farm on disposable hosting. ClamAV and ML classifiers also identified it as malicious, specifically a phishing trojan. While no scripts were directly extracted, the structure and numerous external links suggest an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

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 https://shoppe.everybodyisnotdoingit.org/gift/userfiles/files/metamidomek.pdf In PDF document text
    • http://yjeverspeed.com/userfiles/file/72015916000.pdfIn PDF document text
    • http://geasit.it/userfiles/files/31207968507.pdfIn PDF document text
    • http://angelofthewinds.net/ckfinder/userfiles/files/purifekuxalonerudikiwut.pdfIn PDF document text
    • http://balie.overeembv-profielen.nl/upload/files/22554032871.pdfIn PDF document text
    • https://suavitinhtannha.net/upload/files/74340872379.pdfIn PDF document text
    • http://trubaopt.ru/content/file/38598488022.pdfIn PDF document text
    • https://bursaphotofest.org/uploads/files/19525286502.pdfIn PDF document text
    • http://pomelieagency.com/userfiles/files/divutod.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614389c98735c---bositivuzeladaligutaze.pdfIn PDF document text
    • http://cellesekorea.com/ckupload/files/25642689363.pdfIn PDF document text
    • http://mlead.net/images/e/file/dejugara.pdfIn PDF document text
    • http://www.stemcellhairclinic.com/files/files/pudopidozoj.pdfIn PDF document text
    • https://cryptobasics.biz/uploads/files/divawava.pdfIn PDF document text
    • http://landroverbh.com/ckfinder/userfiles/files/25434360340.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/vavinavonar.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/1525899372.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/88352554454.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/43936182555.pdfIn PDF document text
    • https://strechybenesov.cz/content/kubibuxonulabenepugisa.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/f6e7af93ee9b9bee0f02501d2a772201/lodakejuxitomeju.pdfIn PDF document text
    • http://ajej.pretty-match.com/upload/files/jesokowutobedorewej.pdfIn PDF document text
    • http://patchworkstudio.de/userfiles/file/texujizomaxazorejefu.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/jitiwoketoxino.pdfIn PDF document text
    • http://universalthailand.com/images/uploads/ckfinder/files/rorusifoxasup.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/9607944242.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/HKUGBsJGI0E/uplcv?utm_term=regular+and+irregular+past+tense+verbs+worksheet+answer+keyPDF 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_off0000bc8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC8E 11316 bytes
SHA-256: 5a3d7940f04beeca749c8323533aa4a51f8c151ec9dae4d603ed9b69ab782dcd
font_01_sfnt_off0000d6b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B7 17184 bytes
SHA-256: 0b0ca8642aa9bd1a8af2edf3dbe64a64e9ea50283a51859e1b225327932a26ed
font_02_sfnt_off000102d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1