Malicious PDF — malware analysis report

Static analysis result for SHA-256 78a69e140ee3b034…

MALICIOUS

PDF

69.3 KB Created: 2021-09-30 16:57:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 238a01a5425c92fee27535b638c0f877 SHA-1: 500eff8d71fe07a544e87ceeed645ec54c552fef SHA-256: 78a69e140ee3b03498137d825c7918d8e2101387e655e819d314347986641dc9
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous embedded URLs, many of which are part of link farms on disposable hosting. The ML classifier and ClamAV detection strongly indicate maliciousness, specifically phishing or trojan activity. The 'SE_CALLBACK_LURE' heuristic suggests a potential callback phishing or tech-support scam pretext, aiming to trick users into interacting further.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://laborke.ru/uplcv?utm_term=mini+militia+pro+pack+unlocked
    • http://velocimapper.com/webfiles/file/rusadokevujowivarunazoran.pdf
    • https://grupa-energia.pl/attachments/file/79315157662.pdf
    • https://www.akilciilacdernegi.com/ckfinder/userfiles/files/2742663161.pdf
    • http://sity-luxe.ru/userfiles/file/72197833693.pdf
    • https://jensbrode.de/files/file/49983715458.pdf
    • https://balbok.net/admin/ckfinder/userfiles/files/wuwuxafiled.pdf
    • https://stallion-international.com/userfiles/file/17816691480.pdf
    • http://studioaba.net/userfiles/files/94191334011.pdf
    • http://kpdb.org/userfiles/files/vatomiwazujetifaxix.pdf
    • http://vtvxm.vn/userfiles/file/sexamolanoxopibewoxixax.pdf
    • http://diskacme.dk/images/upload/file/dureruzujo.pdf
    • https://rocksoliddesigns.biz/userfiles/file/38141591838.pdf
    • http://acmemask.com/upfiles/editor/files/77252548491.pdf
    • http://plncse.hu/php_data/file/92078543603.pdf
    • http://harckocsik.hu/userfiles/file/gewabixojejepegiwuramobo.pdf
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/68e4a560beb9f8641d5d7debd3bfeeef/98431356801.pdf
    • https://andana.us/files/files/43920801883.pdf
    • https://girisimhaber.com/uploads/file/56387288060.pdf
    • https://www.agencesramos.com/ckfinder/userfiles/files/lepanol.pdf
    • http://cofetariafraguta.ro/UserFiles/file/linizogikokenaxutaza.pdf
    • http://laptopcuhaiphong.vn/upload/files/84139311323.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16155a6292d646---vobobatokigaw.pdf
    • http://porpora.biz/imagenes/imagenes_contenidos///32032649411.pdf
    • https://salonrewards.ca/images/file/muxatez.pdf
    • https://habibitours.org/ckfinder/userfiles/files/takoke.pdf
    • http://conblocmanado.com/pics/file/lifazoz.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b14b.bin
35476a8c5310313a0ea14f98f1ddfe437222eafc41c869f0874dcb7fb841bf34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB14B 15348 bytes
font_01_sfnt_off0000d726.bin
122ed7889107b480d6a8494f07122afb69bc43223314cfaf61680853b6cebde4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD726 10692 bytes
font_02_sfnt_off0000ef95.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF95 16792 bytes

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