Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3f6d7050efdacae…

MALICIOUS

PDF

75.7 KB Created: 2021-09-12 17:02:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2a427c2b7fa29ac90f55b95d8b59b76a SHA-1: 4358aa802dd5d8d1f2885670051f1cf943ad93b2 SHA-256: f3f6d7050efdacae25270af34b90688dd3e46e24d02e1803bbadc68da8211b0f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the nature of the embedded URLs and the detection signatures point towards an attack pattern involving directing users to malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://gewoongroen.eu/app/webroot/files/userfiles/files/95225829257.pdf In PDF document text
    • http://tecksco.com/upload/files/48630096918.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/kajuxataba.pdfIn PDF document text
    • https://5udua.com/contents/files/79844607410.pdfIn PDF document text
    • http://dongduong.net/Images_upload/files/zarawebolofurozi.pdfIn PDF document text
    • https://efsanepin.com/calisma2/files/uploads/37122737118.pdfIn PDF document text
    • http://studiomuraca.eu/userfiles/files/18494496049.pdfIn PDF document text
    • http://gzlmjx.com/data/home/bxu2343160066/htdocs/uploadfile/files/39885278784.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/50581963407.pdfIn PDF document text
    • http://wx-bm.cn/upload/ckimg/files/202109041206287988.pdfIn PDF document text
    • http://yuli-china.ru/d/files/ginosakotedofopene.pdfIn PDF document text
    • http://sudeoksa.com/userfiles/file/20210909160721.pdfIn PDF document text
    • http://utcsp2.rustyramone.com/uploads/files/juvinikowu.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/21011375250.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/50757452351.pdfIn PDF document text
    • https://vas-vill.hu/userfiles/file/togerabilokara.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/12f384686a75fe3b119408a5faf46c76/38039151762.pdfIn PDF document text
    • https://vpmemorial.net/images/file/nugigoxozaxudebumiwele.pdfIn PDF document text
    • http://www.solarwindependence.com/ckfinder/userfiles/files/14604022374.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/20c376d06946c1e414382d0c03acd629/19886712099.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/64207262345.pdfIn PDF document text
    • http://nut-shell.net/upload/files/75454427931.pdfIn PDF document text
    • http://detskypohar.cz/upload/file/vaxazuno.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/fedawokutej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=games+like+parallel+kingdom+2020PDF 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_off0000c497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC497 16780 bytes
SHA-256: 90720d66e28827f596206c737def6afd0bf03f6ff055532122b4a0cf0a3e7952
font_01_sfnt_off0000efe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10800 11012 bytes
SHA-256: 12136dd9bf64d599b78263241ee476749a6226bd080549b1b84034182f93829f