Malicious PDF — malware analysis report

Static analysis result for SHA-256 28cfce795201593f…

MALICIOUS

PDF

85.9 KB Created: 2021-10-15 02:56:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b3760eb1e4b36671d1fcfa6d49178fcc SHA-1: e7ab5ef63f4472569d70762575a6be7bfba75ab1 SHA-256: 28cfce795201593f3effd6681816b23964d684932fa0cdf89119db7c8035f81b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm. Numerous embedded URLs point to potentially malicious or unknown domains, suggesting an attempt to redirect users to harmful content. While no scripts were directly extracted, the PDF structure and the nature of the heuristics strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://pobierzplik.pl/uploads/files/muforujidalaropenote.pdf In PDF document text
    • http://battle.bpv.su/content/files/files/26629165173.pdfIn PDF document text
    • https://tempatpasang.com/contents/files/mogalawi.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/tobidoruwexuxugufuna.pdfIn PDF document text
    • http://varvshistoriska.com/file/26542647454.pdfIn PDF document text
    • https://markapin.com/calisma2/files/uploads/napikatof.pdfIn PDF document text
    • http://zezoalza.com/ckupload/files/6314446686.pdfIn PDF document text
    • http://rebornfair.com/FileData/ckfinder/files/20211010_7983B793AEAF8847.pdfIn PDF document text
    • https://oykufestivali.com/ckfinder/userfiles/files/vegigebimezuwepe.pdfIn PDF document text
    • http://m-camper.ru/ckfinder/userfiles/files/vemilatabapefudiriwo.pdfIn PDF document text
    • http://geombiagioschettino.eu/userfiles/files/70438674459.pdfIn PDF document text
    • https://valleyrentals.com/userfiles/file/mekusoxevofunopuf.pdfIn PDF document text
    • http://ibarugi.com/fckeditor/userfiles/file/53919777608.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/kne48id7rjovu4u90nampjm3a0/wiwimikusirigonirimomapos.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/84973562210.pdfIn PDF document text
    • http://rent-lease-no1.com/userfiles/file/20211001001212.pdfIn PDF document text
    • http://mama-care.com/UserFiles/file/37504250104.pdfIn PDF document text
    • http://solarexperten.ch/fckeditor/editor/images/file/wazubaxupabeke.pdfIn PDF document text
    • http://boston.pl/fck_pliki/file/41557517910.pdfIn PDF document text
    • http://honda-vo.com/upload/file/kegabikana.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7cb37fa0c---10516151395.pdfIn PDF document text
    • http://chinahongji.com/d/files/lirifixidikokojukifibovob.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/xPAns0MRe5M/uplcv?utm_term=pokemon+go+how+to+become+lucky+friendsPDF link annotation
    • 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_off0000e49a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAC 20036 bytes
SHA-256: c3edb982e985a8f944f616a747d4c31201cfbf1cca7407706b523e8e4bf5d82f
font_02_sfnt_off00012ff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FF8 11296 bytes
SHA-256: 4ebe463e83102b62eca5cdb621031486c8070281426de9e29660fc3170aefee2

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