Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d93f0bab08a8558…

MALICIOUS

PDF

87.9 KB Created: 2021-09-21 09:13:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f8b395822aede3329ca23fd725629c5e SHA-1: 0fbe6cf31c2915cce3b49c22170a00fb89cda18d SHA-256: 5d93f0bab08a85587ad156efc0da8ca247c3268be6d5f2fc7fc5575181fd4d08
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The presence of numerous embedded URLs, many pointing to PDF files on disposable domains, suggests a link farm or phishing lure. The 'SE_URGENCY_LURE' heuristic indicates the document likely contains urgent language to prompt user action. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://katachizu.com/img/news/files/68967655396.pdf In PDF document text
    • http://footstepfloor.com/upfiles/files/71499076865.pdfIn PDF document text
    • http://tajeer.co/userfiles/file/43478033029.pdfIn PDF document text
    • http://www.520amis.com/upload/files/729971947.pdfIn PDF document text
    • http://yey.uw52.com/upload/files/josasubujaxititokawasugaw.pdfIn PDF document text
    • http://silverk.ru/img/lib/file/62887135202.pdfIn PDF document text
    • https://aznamaste.com/ckfinder/userfiles/files/dujimuwefoduv.pdfIn PDF document text
    • http://studiotecnicomaglio.it/userfiles/files/11362368551.pdfIn PDF document text
    • https://reniuved.it/file/dudebuwitugesaw.pdfIn PDF document text
    • https://coevent.ru/upload/files/negusekerekaloxafugez.pdfIn PDF document text
    • https://e-motorcycle.tw/upload/emotorcycle/files/98188725789.pdfIn PDF document text
    • http://doingthing.com/downloads/blog/geust/files/3230232593.pdfIn PDF document text
    • http://pekbdt.com/filespath/files/20210903033008.pdfIn PDF document text
    • http://aotwcasino.com/ckfinder/userfiles/files/77870401152.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/nulukobakezanugomifi.pdfIn PDF document text
    • http://kleinschaden-expert.com/userfiles/file/13080988356.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/95061032255.pdfIn PDF document text
    • http://caerulumpharma.com/upload/files/92139001655.pdfIn PDF document text
    • http://alphanaturehk.com/userfiles/file/jigigufurebokej.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/zufevetalopoxopawawuxe.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614002c2da3cc---kekolufegitaxanosox.pdfIn PDF document text
    • https://ms02bet.net/contents/files/76929972074.pdfIn PDF document text
    • https://cicimanis.com/contents/files/15907781265.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613176080a362---kebinejixidolewanasa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=gmail+account+bypass+apkPDF 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_off0000f40a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40A 17636 bytes
SHA-256: fce29713cffd8c3e62057ea456f04aecb6b4823b81f1956ac653171a4fee1072
font_01_sfnt_off0001211c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1211C 10788 bytes
SHA-256: 221de047e2a15f94ac380f3643b6798fea27ab1cf73b2b514db3125aa0c49633
font_02_sfnt_off000139cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1