Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ff01b85ebdece69…

MALICIOUS

PDF

82.8 KB Created: 2021-09-13 16:01:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 37e3f2c56fb6ee91d76b24a849ca5180 SHA-1: 3794f684ac600b65d383c6fcbf12fdb8f946af0d SHA-256: 0ff01b85ebdece697aac258d0fe5b9e726fecf0aa7d98dbfcd3b0e2ac09a017b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://huntic.ru/uplcv?utm_term=update+emulator+android+studio
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d16de53086---pagudafigu.pdf
    • http://fsoa.cn/userfiles/file/21301192766.pdf
    • http://pascalparrot.com/uploads/assets/file/87267221988.pdf
    • https://aakritidigitals.com/userfiles/files/89771906555.pdf
    • https://tsegypt.com/file/21971574731.pdf
    • http://cauthangdep24h.com/upload/files/dareri.pdf
    • https://goodnest.info/tctt/sites/aaa/file/46437448787.pdf
    • http://smartvoicecom.com/userfiles/gipawaxomos.pdf
    • http://masan315.net/board/imagefile/file/likere.pdf
    • http://karimeh.com/public/userfiles/file/vuribekoj.pdf
    • https://pmfegypt.com/userfiles/files/nimiro.pdf
    • http://noithatmyhome.com/img/files/22197756685.pdf
    • https://songod.vn/uploads/image/files/tekajerunow.pdf
    • http://ruresept.ru/files/file/rurovopesekuzewigaganoji.pdf
    • https://hahapediatric.com/uploads/files/202109060031368787.pdf
    • http://ailizia.com/userfiles/nalunesibegitavofowi.pdf
    • http://finproekt-msk.ru/userfiles/file/81851103730.pdf
    • http://amdind.com/userfiles/file/makewatezomugerede.pdf
    • https://bunexim.dascalita.ro/app/webroot/files/userfiles/files/mutixofulev.pdf
    • http://ammk.sk/userfiles/file/22824607387.pdf
    • http://wx-test.com/upload/ckimg/files/202109072044038435.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e068.bin
363e3b35b074c2a305894229b1af06103d42320488eb5176400081d839b85644		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE068 17236 bytes
font_01_sfnt_off00010d92.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D92 16792 bytes
font_02_sfnt_off000125a9.bin
ad23a497b48ba702867a89c20bcb673edb139bd3794f1cb4611208b7cfe20a74		 pdf-font-stream PDF embedded font (sfnt) at offset 0x125A9 10660 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.