Malicious PDF — malware analysis report

Static analysis result for SHA-256 34c1a128ea09acce…

MALICIOUS

PDF

91.3 KB Created: 2021-05-25 03:56:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13c15ebb8345135ff6e2f416b6315f1c SHA-1: 5ca19f6649f0fea43852f43dc64438479c26d0ed SHA-256: 34c1a128ea09acced942b6ce6a5344ed569797b851c2e6dddcb2b97695c839c2
164 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on suspicious domains and appear to be part of a link farm. The ClamAV detection and ML classifier indicate malicious intent, likely related to phishing or malware distribution. The embedded URLs suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://kuzutuzo.ru/strik?utm_term=chhota+bheem+and+krishna+full+movie+kirmada
    • https://static.s123-cdn-static.com/uploads/4451542/normal_5ff991e2662b7.pdf
    • https://mujiborabasovu.weebly.com/uploads/1/3/4/5/134590634/maganizefedu.pdf
    • https://cdn-cms.f-static.net/uploads/4373301/normal_602197d53b0cd.pdf
    • https://tavifarexup.weebly.com/uploads/1/3/4/6/134611028/46fdf55b779be.pdf
    • https://belinadojo.weebly.com/uploads/1/3/1/6/131607131/kowamakogamok.pdf
    • https://fukikabigo.weebly.com/uploads/1/3/4/4/134457586/429a5a8a6.pdf
    • https://durezawower.weebly.com/uploads/1/3/4/4/134472500/vaxibomekofub-zesuxudur-kabagopo-wawasugeromuwo.pdf
    • https://static.s123-cdn-static.com/uploads/4384142/normal_5fcb8eb99a765.pdf
    • https://cdn-cms.f-static.net/uploads/4392872/normal_606871d84d9a1.pdf
    • https://degubazof.weebly.com/uploads/1/3/5/3/135304991/sejinazur-kazow-kepatu-solegeli.pdf
    • https://nekazadezi.weebly.com/uploads/1/3/4/6/134662300/duxam.pdf
    • https://tutobino.weebly.com/uploads/1/3/2/6/132695576/xabavow_tefawi_nupubufeva_fagepalanod.pdf
    • https://nalabusapigo.weebly.com/uploads/1/3/2/7/132740218/rolexevunorofi-vazudotaz-guviwujulu-fatikuvog.pdf
    • https://selisibukexapa.weebly.com/uploads/1/3/4/3/134317440/1449563.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/paxivogedewilu/topeduwapazipewumiseka.pdf
    • https://s3.amazonaws.com/jaxesabi/amman_tamil_dubbed_movie_songs_free.pdf
    • https://s3.amazonaws.com/tetenifeme/is_oxford_comma_ap_style.pdf
    • https://s3.amazonaws.com/gorajikunobixi/ray_bradbury_the_veldt_questions.pdf
    • https://s3.amazonaws.com/niwotipugonuvoz/gaxawegevaremidaduxe.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000110aa.bin
bfc1b26d7596a620c7b50867d155cafa84af7fc2afbe9eb1ec1e1fd774eaf658		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110AA 5316 bytes
font_01_sfnt_off0001228e.bin
ac81300d1a793617821490002f96c1a59554847a134589699fdf9f09722415cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1228E 10960 bytes
font_02_sfnt_off0001485b.bin
6e3fbd491d8b71441998836ddca0d0c102716a221ea14f8143929167ad9a79b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1485B 16164 bytes

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