Malicious PDF — malware analysis report

Static analysis result for SHA-256 137931c891e92c0d…

MALICIOUS

PDF

71.3 KB Created: 2021-09-25 12:47:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e585a927073d746f4a7789e9a8f00309 SHA-1: fdfac91b8634e20be4471875975acbbf5cfc2013 SHA-256: 137931c891e92c0dcaa41bb886c2750d6fc729cfa1d997e04a58ae698f44fd4d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and numerous external links point towards a malicious lure, likely designed to redirect users to compromised or malicious websites.

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://archism.ru/uplcv?utm_term=escape+room+watch+free PDF link annotation
    • http://bindashnews.com/userfiles/file/84667681122.pdfIn PDF document text
    • http://gysanya.com/upload/file/210923075554044229ug8gs99ljfb9.pdfIn PDF document text
    • http://annuaire-regional.com/ckfinder/userfiles/files/pulatovaxukosedarid.pdfIn PDF document text
    • http://mezon.jp/userfiles/file/vipusumijabedu.pdfIn PDF document text
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/limemosironuvekoguderut.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/61341876876.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/vijopederuwuvawopifitune.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/42884960373.pdfIn PDF document text
    • http://uktohabbarijamalta.com/files/file/81000340985.pdfIn PDF document text
    • http://voijin.com/userfiles/files/99766898895.pdfIn PDF document text
    • https://gogift-it.com/userfiles/files/gexifevowubugowezebepasad.pdfIn PDF document text
    • http://packturf.fr/files/podak.pdfIn PDF document text
    • https://dm288.rs/slicice/file/zomibedejepu.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/taxeba.pdfIn PDF document text
    • http://skalamatbaa.com/userfiles/file/61634625496.pdfIn PDF document text
    • https://bwhe.in/ckfinder/userfiles/files/37597509161.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210908010750_c5jj8g.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/49110307918.pdfIn PDF document text
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/45878396403.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/felaponasoxatatidumipijin.pdfIn PDF document text
    • http://kemmurad.com/webroot/img/files/91407659513.pdfIn PDF document text
    • http://vibrobeton.by/pics/files/palunajifavobelalam.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/xusipebono.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/42038098813.pdfIn PDF document text
    • http://alanaf.ru/userfiles/files/wagafujupirefusarumoxosi.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_off0000b4c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4C8 16560 bytes
SHA-256: fe5ea09e97b5b7e9054bd50d4c238397603bd175e715ad4de2fcaec5b1d1b54d
font_01_sfnt_off0000df21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF21 10572 bytes
SHA-256: dbf2439be7dc9d11a736ca7f1bbfbc5762bc3096d0125107738b6a5e8e77e8bc
font_02_sfnt_off0000f75f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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