Malicious PDF — malware analysis report

Static analysis result for SHA-256 c06fb4739103f7ef…

MALICIOUS

PDF

68.8 KB Created: 2021-09-30 22:32:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1df822d7b1728167e0f0aa8b62744dc1 SHA-1: 4fa8d037b2205d8267c9d2d975e75c9b7f150dae SHA-256: c06fb4739103f7efc12f6f7171d50c630459a5ea8b87c19bd21a6163e1391ea6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting an attempt to redirect users to malicious content. The presence of embedded JavaScript, though not explicitly detailed, is a common vector for exploiting PDF vulnerabilities or delivering further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://pixomot.ru/uplcv?utm_term=being+mortal+atul+gawande+pdf+free+download PDF link annotation
    • http://oasis-inwaste.asia/files/file/95631482742.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/gefovositabono.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/89221274729.pdfIn PDF document text
    • http://tupnate.com/ckfinder/userfiles/files/50094359229.pdfIn PDF document text
    • https://kuepancong.com/contents/files/fizolisigarufuwanuxow.pdfIn PDF document text
    • https://goodnest.info/tctt/sites/aaa/file/80339215741.pdfIn PDF document text
    • http://ghettaetamionarchitetti.it/userfiles/files/54985764648.pdfIn PDF document text
    • http://rsport.eu/yonexshop/static/file/85147955010.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/5sft0enqq5a68mbv0dd503autotflnq0/72349143326.pdfIn PDF document text
    • http://holzbau-napetschnig.at/14283357056.pdfIn PDF document text
    • https://rjpexport.com/files/42732684352.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/vufusum.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/65352153813.pdfIn PDF document text
    • https://equimat-cheval.fr/file/jolenidabilanemujop.pdfIn PDF document text
    • http://sunmoon-glory.com/web/upload/files/54804984618.pdfIn PDF document text
    • https://magerp.org/upload/files/67514664399.pdfIn PDF document text
    • http://psycare-spb.com/userfiles/file/42004066647.pdfIn PDF document text
    • http://www.thaitofu.com/image/upload/File/54556333915.pdfIn PDF document text
    • http://locthanhroyal.com/upload/files/33673926629.pdfIn PDF document text
    • https://kettosallampolgarsag.net/imagini_ws/zezuvumisaborew.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/0e1d2632e5b9e8028e0aa0b04afa41b7/67763532360.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_off0000ae32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE32 15284 bytes
SHA-256: 8c2507e77a7b56c3f41c824afaf556aabaa6e7e313d372a1ee7536c617219778
font_01_sfnt_off0000d4f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0A 10912 bytes
SHA-256: c11b1365bd39b382c18e30030e922f0af9e85d593097bd040d9edc06113d2396

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