Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a20758e1a78b27f…

MALICIOUS

PDF

81.7 KB Created: 2021-09-15 20:59:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7c7e9904ef2d7b6009b17490a1c33d73 SHA-1: 7b8ebafb3637d00cc9da93d5b2faebe72e2fa369 SHA-256: 8a20758e1a78b27f561350a9a805625481f744bd3d4105b43fecad5758d9bc91
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 embedded URLs pointing to disposable domains, indicating a link farm designed to redirect users to potentially harmful content. The document body is heavily obfuscated, but the presence of external URIs and the link farm heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://smidgel.ru/uplcv?utm_term=wwe+2k15+psp+iso+highly+compressed+download PDF link annotation
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/1892922013.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/1668638007.pdfIn PDF document text
    • http://cheniou.handysociality.com/upload/files/83262217147.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/64747569533.pdfIn PDF document text
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/72873556366.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/65259463807.pdfIn PDF document text
    • http://giasuthanhdat.vn/Images_upload/files/85229071009.pdfIn PDF document text
    • https://fetogram.ir/images/upload/files/pegemiriterirelajubek.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210912074552.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/40074600606.pdfIn PDF document text
    • https://hotararicedo.ro/files/files/wejifasasezepinigiditat.pdfIn PDF document text
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/mamugetotalimemaxujabop.pdfIn PDF document text
    • http://elcolono.net/userfiles/files/xideruvizike.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/zororojapurezabid.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/95337420456.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/poxadijojisokuwaruf.pdfIn PDF document text
    • http://ge-mak.com/files/xufunujesovimun.pdfIn PDF document text
    • https://e-motorcycle.tw/upload/emotorcycle/files/40874221308.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/hlsqig2cuut10jvkf7b92gb288/66356470415.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/p1hoj8f0oblbcfpi77n1vvqis8/23072452935.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/80230451457.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/tekujasibimijasigo.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_off0000d732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD732 11452 bytes
SHA-256: d700d868ee3d11da0d4497f43156ac91373f7eabf49021c81f0827402aa379e6
font_01_sfnt_off0000f20e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A20 17904 bytes
SHA-256: b74e1adfaa61f00b93d5745267cdb815df0371560aef75b91228233d4605bdb2

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