Malicious PDF — malware analysis report

Static analysis result for SHA-256 dab26ef6c9b03247…

MALICIOUS

PDF

70.3 KB Created: 2021-09-19 18:24:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 71407f0e54b019a4231309aa883d8efd SHA-1: 2defac96f5eca9919b2d64db752b0893669a6258 SHA-256: dab26ef6c9b032479083a7de34bf420534b04d4e3c1695cfc1f73f999c16b925
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, with one specifically identified as an external URI pointing to a potentially malicious domain. Heuristics indicate the PDF functions as a link farm on disposable hosting, and ClamAV detection confirms its malicious nature, likely as a phishing or malware distribution vector. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://nomylo.ru/uplcv?utm_term=twilight+2+full+movie+eng+sub PDF link annotation
    • https://chiuman-hk.com/images/file/41725843980.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/8341822674.pdfIn PDF document text
    • http://lyzph.com/userfiles/file/Fl202109171059145660.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/giginijuwitu.pdfIn PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614587bae3c26---dumalob.pdfIn PDF document text
    • https://austarpharma.com/upload/files/tegeviwok.pdfIn PDF document text
    • http://gcsiva.com/files/userfiles/file/guxomaruroturovabutu.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/6e0def9cf3dfbdec0b4d8e59d154c069/finimukerinagixop.pdfIn PDF document text
    • http://razzledazzleevents.in/userfiles/file/52246264779.pdfIn PDF document text
    • https://elperrocallejero.info/ckfinder/files/zetilixizumu.pdfIn PDF document text
    • https://regenerateacademy.com/file/12924817705.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/23224178922.pdfIn PDF document text
    • https://pleasanton.com/wysiwygfiles/file/jipolozeterorubuvijigibu.pdfIn PDF document text
    • http://www.ruben.pl/ckfinder/userfiles/files/16776354758.pdfIn PDF document text
    • http://bestpokeya.com/uploads/files/bazirajabedufub.pdfIn PDF document text
    • https://badoza.net/userfiles/file/65702179097.pdfIn PDF document text
    • http://studiotecnicomaglio.it/userfiles/files/rigaxurosogutot.pdfIn PDF document text
    • http://bestpokeya.com/uploads/files/11896297733.pdfIn PDF document text
    • http://www.smwiarus.pl/ckfinder/userfiles/files/32838816994.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///61668471485.pdfIn PDF document text
    • http://vanguardhungary.hu/userfiles/file/91616892131.pdfIn PDF document text
    • http://veterky.ru/ckfinder/userfiles/files/sidibigubugoro.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_off0000b27e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB27E 10872 bytes
SHA-256: fb1a759f45a29e34f438da66a3fc606392b840691eca519d0ccc07ae4ee92061
font_01_sfnt_off0000cb8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e3a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A0 15656 bytes
SHA-256: e1802d367cfac0b70d44c8041ab26c683f89705e2ff084da335172b488db4439

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