Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe45894a8fabe447…

MALICIOUS

PDF

68.7 KB Created: 2021-09-24 15:06:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 686e7be9816e6ef20181a627cf82eabb SHA-1: e191cff33224477a091b09d114a578c3b6a09508 SHA-256: fe45894a8fabe447c62caeea6c017d529a316317d2449f81810083af56b7591c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a likely attempt to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, identifying the document as a link farm on disposable hosting. No scripts were extracted, but the structure and heuristics strongly suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://wastran.ru/uplcv?utm_term=a+quiet+place+2+watch+online+full+movie+free PDF link annotation
    • http://186086.com/upload/files/84303076018.pdfIn PDF document text
    • http://smlstripedbass.com/home/rock/public_html/ckfinder/userfiles/files/19290161960.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/33950894944.pdfIn PDF document text
    • http://masterkontroll.hu/ckfinder/userfiles/files/8599009018.pdfIn PDF document text
    • https://rajaketiga.com/contents/files/59256479033.pdfIn PDF document text
    • https://pepsima.biz/files/file/76371807270.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad810d3811---finekojira.pdfIn PDF document text
    • http://machin.kr/userData/board/file/57787059178.pdfIn PDF document text
    • http://motopujcovnateplice.cz/userfiles/file/79558415630.pdfIn PDF document text
    • http://www.swaving-stalinrichting.nl/ckfinder/userfiles/files/rukitosota.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/6796476913.pdfIn PDF document text
    • http://royalleasingny.com/admin/images/file/kirelalapoganabekitipos.pdfIn PDF document text
    • http://mrs724.ir/basefile/drtiketcom/files/37608262586.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/xetowaditi.pdfIn PDF document text
    • http://master-vin.ru/files/file/pajedomubor.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/24568340108.pdfIn PDF document text
    • http://vdtonline.vn/static/uploads/editor/files/dufoxebixamaj.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/xunobexurupolojuvokij.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/76820400538.pdfIn PDF document text
    • http://generale-bureautique.fr/gdb/files/file/88670055232.pdfIn PDF document text
    • http://architettotoma.it/userfiles/files/difup.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/90934435408.pdfIn PDF document text
    • https://tepatsasaran.com/contents/files/20104802942.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f73229dad---pijutuxade.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_off0000af44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF44 11076 bytes
SHA-256: 4ec4febc9ea208d07ebd7eeb0eed1603df74be66086aafd7f6b6fe8760fc31b4
font_01_sfnt_off0000c902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC902 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE114 14552 bytes
SHA-256: 4313a2e61ff66debe5d93b17d859e60f0953d7579bec6bb09c3eb0eed805c7e9

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