Malicious PDF — malware analysis report

Static analysis result for SHA-256 f81dac3dc71f291a…

MALICIOUS

PDF

80.6 KB Created: 2021-09-21 20:18:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 82dc769297d876293e59f88a1bb7d8a6 SHA-1: 7fad92742edb543e80770e0e340f7dc6778441a1 SHA-256: f81dac3dc71f291ac0c5de98718fdb0ca217ff5b9e9555931fa63d0efbe99be2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification. While no scripts were explicitly extracted, the presence of external URIs and the link farm nature suggest an attempt to redirect users to malicious content, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pixomot.ru/uplcv?utm_term=anna+karenina+streaming+vf PDF link annotation
    • http://cuacuonanbinh.com/userfiles/file/2276008891.pdfIn PDF document text
    • http://biogenetec.tw/image/files/20210909_151053.pdfIn PDF document text
    • http://gcsiva.com/files/userfiles/file/45045143993.pdfIn PDF document text
    • https://gencshow.com/upload/ckfinder/files/nitelozitozer.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/49245692256.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/wisozupogajafulidemakitog.pdfIn PDF document text
    • https://edubox.mn/uploads/users/0/files/rabazikurinodexudipabadun.pdfIn PDF document text
    • http://antopol.topmebli.com/content/xuploadimages/file/medibaranuder.pdfIn PDF document text
    • http://viettranslators.com/webroot/img/files/nibezoduxexusulovemoveja.pdfIn PDF document text
    • http://euroear.eu/ckfinder/userfiles/files/15746344995.pdfIn PDF document text
    • http://xn--3bsx3iw22bmot.com/filespath/files/20210910033751.pdfIn PDF document text
    • https://kingcom.edesign.fr/gr33/web/uploads/assets/file/dubudesirarapuko.pdfIn PDF document text
    • https://nistd.in/userfiles/file/78299459386.pdfIn PDF document text
    • https://mimpiindahsatu.com/contents/files/gaberope.pdfIn PDF document text
    • http://idominjazz.com/fckeditor/userfiles/image/25346649768.pdfIn PDF document text
    • http://richardchong.com/userfiles/files/28470577263.pdfIn PDF document text
    • https://ikuseikyokai.jp/ckmedia/files/30379574638.pdfIn PDF document text
    • http://transportdiverse.com/uploads/files/fekatixodarajozuf.pdfIn PDF document text
    • https://wittnebel.dk/file/64600747777.pdfIn PDF document text
    • https://andrejc.si/files/file/netuvudusaxuluv.pdfIn PDF document text
    • http://iweldbot.com/ckfinder/pho/files/46608797011.pdfIn PDF document text
    • https://yellowstonewildlife.com/jexireditirizafigipaza.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/d06ddcb130c3a7dd6b973dcff0e53e62/samamana.pdfIn PDF document text
    • https://ubitanduk.com/contents/files/54119016402.pdfIn PDF document text
    • http://hwangtosidae.com/userData/ebizro_board/file/94098710552.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_off0000d776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD776 10528 bytes
SHA-256: b5daed2c47b007a06b55184ffbdebd3821b743a233dce6f209a6561ec274a35e
font_01_sfnt_off0000ef81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10793 17524 bytes
SHA-256: 2c89f0bdd6b00fc96f43a43a5bf92a9193c47da484a717e8a09ef6adbed3edca

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