Malicious PDF — malware analysis report

Static analysis result for SHA-256 edfe238e7a3f2307…

MALICIOUS

PDF

75.7 KB Created: 2020-11-13 08:05:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 34a57bd3f87d7235ad1f25a180125718 SHA-1: 1a8a8188201338a82e560c0e2fa198bd0ccc5866 SHA-256: edfe238e7a3f23074ebabdc0aab2106be49afba9e4273c9938568ed9a2591ef4
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or redirection scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://traffnew.ru/aws?utm_term=angadi+theru+movie+songs+free
    • https://wevuviwujito.weebly.com/uploads/1/3/1/6/131636984/62a8fd2c3ac0.pdf
    • https://toxodapakaxoza.weebly.com/uploads/1/3/4/5/134525452/1326199.pdf
    • https://cdn-cms.f-static.net/uploads/4412902/normal_5fa50292e1617.pdf
    • https://zovotinaselon.weebly.com/uploads/1/3/4/5/134589175/milabovo-tiremumeve-vugivafuziva.pdf
    • https://vuzaruluweketex.weebly.com/uploads/1/3/4/4/134478477/jakedaregex-beniguki.pdf
    • https://cdn-cms.f-static.net/uploads/4389366/normal_5fa1f8d2cc1ed.pdf
    • https://cdn-cms.f-static.net/uploads/4386591/normal_5fadccf88faf3.pdf
    • https://tubenuluni.weebly.com/uploads/1/3/1/4/131437864/watokifijesomozebef.pdf
    • https://firedisivimi.weebly.com/uploads/1/3/0/9/130969818/5920049.pdf
    • https://bixedonaxube.weebly.com/uploads/1/3/4/6/134619794/nupuwebivisanurev.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/xanebavifamopez/69577487602.pdf
    • https://uploads.strikinglycdn.com/files/93097eb2-6ed9-4c68-9fa3-df5a2db041ec/nebadonidebiwikugav.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://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c81c.bin
ec536ab3dbc3095a938efbdc1746f94a8c716263109bf12156755bfb67ab98fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC81C 5220 bytes
font_01_sfnt_off0000d9b2.bin
6017e14808fc8cb6e41314617144d1db7431b056edcb8f58f98a40ae191d781f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B2 10728 bytes
font_02_sfnt_off0000fea3.bin
e296a61d2d303e35be9e1a35631556663d2780498efa7e8f3867bf557f172fe6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA3 16164 bytes
font_03_sfnt_off000113ba.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113BA 4324 bytes

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