Malicious PDF — malware analysis report

Static analysis result for SHA-256 909c2a1377f2fe1a…

MALICIOUS

PDF

84.7 KB Created: 2021-10-09 09:02:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 84b6ae30fdb614a8f015ed61d7734fba SHA-1: b2710d66d3b844f9f37e843c7526c1cbe8253002 SHA-256: 909c2a1377f2fe1ae934ac2bb32d9ae9277fd99ed1f0df0160f617299496500d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, with a high heuristic firing indicating it's a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware through the linked content. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL heuristics and AV detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://knupress.com/pds/editor/file/56453253133.pdf In PDF document text
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/16525092117.pdfIn PDF document text
    • http://labotinnghia.com/img/files/lafavopumekudewibusebexe.pdfIn PDF document text
    • https://www.medicalbi.com/ckfinder/userfiles/files/10278646790.pdfIn PDF document text
    • http://offerparts.com/upload/files/tujipusibabidunil.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/meposososej.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/s00k764mijmukcv67ijjcn7ar7/46938703958.pdfIn PDF document text
    • http://itagqatar.zajeltel.com/itag/file/files/zasikulivogifox.pdfIn PDF document text
    • http://pbhdom.eu/userfiles/file/babupe.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615da87043d85---zozedutidifixowaki.pdfIn PDF document text
    • https://livermore.com/wysiwygfiles/file/ritazatusaz.pdfIn PDF document text
    • http://xn----ftbkdcamitb5h.xn--p1acf/files/fck/file/ratimalid.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/35307481017.pdfIn PDF document text
    • http://2m-m.eu/userfiles/files/ziterenadezitawovejegula.pdfIn PDF document text
    • http://tainghe.vn/userfiles/file/pesiwefisur.pdfIn PDF document text
    • http://bjqyms.com/filespath/files/20210928062030.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/72594977319.pdfIn PDF document text
    • https://gilbertems.com/videos/file/logokurefovagivatawox.pdfIn PDF document text
    • https://rasathantrananotech.com/ckfinder/userfiles/files/wiruri.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202109051620419427.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/mesor.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/vigabararirebiloz.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/viradoropeki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=dilwale+full+movie+download+sd+movies+pointPDF link annotation
    • http://cluster006.ovh.net/~greeters/namur/ckfinder/userfiles/files/nases.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_off0000e38c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE38C 10812 bytes
SHA-256: 035bec552a72f0a9d13102cc81e736125e8fd21b28afe5afffa53fb55d7c345b
font_01_sfnt_off0000fc81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC81 18732 bytes
SHA-256: ee4032ef7040f1d77ef4d1a309ef01507daa1f5647615fb135f302c4bf80426b
font_02_sfnt_off00012ce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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