Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4469492a4a550eb…

MALICIOUS

PDF

70.9 KB Created: 2021-09-24 12:45:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8e668d1db9f4aa1298561820734118e1 SHA-1: d8c18a2964cffa49d39cafc554c75055050f628f SHA-256: d4469492a4a550eb20fa4a0401261390673d7be5412e47f04b43071e26591935
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, a common tactic for phishing and malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to trick users into downloading an APK. No scripts were extracted, but the structure and URL patterns are highly indicative of a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://crysiq.ru/uplcv?utm_term=mod+apk+rush+royale PDF link annotation
    • http://jfe.hk/userfiles/xezemov.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/fuveronipape.pdfIn PDF document text
    • https://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/wajadipagi.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/6463835566f3bc1e8948668ee377aecd/22101153115.pdfIn PDF document text
    • https://mimpidia.com/contents/files/2652250561.pdfIn PDF document text
    • https://yuvasarkar.org/userfiles/file/runofirakejawekasideg.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210907_F6C55D6E76D8D3EA.pdfIn PDF document text
    • http://mega.kz/media/upload/files/figojivi.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/pufujedisa.pdfIn PDF document text
    • https://gregoryshow.ru/files/file/24410351868.pdfIn PDF document text
    • http://www.niceresidence.net/image/upload/File/jitijopuxapomosupogiret.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/zaniwelizevanajede.pdfIn PDF document text
    • http://sintjorisparochie.nl/userfiles/file/loxenimasaduzapower.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/84302837919.pdfIn PDF document text
    • http://tns-china.cn/editor_upload_image/file/15906502962.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/23880104567.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/tefobonedirowar.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/sotajikojebigagoxifuv.pdfIn PDF document text
    • http://productinfo.in/konadnew/userfiles/file/wemajeperodapemexag.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/161335d845fc20---fatiwodedugixi.pdfIn PDF document text
    • https://lorus.rs/files/sowen.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/surij.pdfIn PDF document text
    • http://presupuestos.pavysan-bigmat.es/ckfinder/userfiles/files/47846168723.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_off0000b026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB026 17880 bytes
SHA-256: 22b2bd3f40413bc2f533e60a18c8e5a9b72f83ff7c51b906afffcaab101a864b
font_01_sfnt_off0000de73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE73 10492 bytes
SHA-256: c2cb30e409edf329403a751a05902f3425dae93a5f0e2065c2ed011ebead5921
font_02_sfnt_off0000f67b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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