Malicious PDF — malware analysis report

Static analysis result for SHA-256 66ed388ac5b00b49…

MALICIOUS

PDF

73.8 KB Created: 2021-06-01 04:30:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3dfe628aae79d592f465ad3ff1e24e68 SHA-1: 1729c5d53f2945d8f8e39a74d6f2c3df1fb507c4 SHA-256: 66ed388ac5b00b4918d8e1efeb68d77d262bf87c4b444621f3b6756cf4077533
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to file-sharing or document hosting services, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards an attempt to manipulate search engine results or redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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
  • 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://inwebjor.ru/pbw?utm_term=jean+baudrillard+simulacra+and+simulation+meaning
    • https://jevejokanidepit.weebly.com/uploads/1/3/0/9/130969277/saguxenizata-fuwitepemeve-tulubex-sewerigojabek.pdf
    • https://xuduburuk.weebly.com/uploads/1/3/4/3/134323667/3512134.pdf
    • https://kabixiwuvilaz.weebly.com/uploads/1/3/2/6/132681231/zusinudekipixa-miroditezagiv.pdf
    • https://rigavedisibabaz.weebly.com/uploads/1/3/4/9/134902328/samototuxupir.pdf
    • https://jenodefutufute.weebly.com/uploads/1/3/4/3/134373351/gipuresume.pdf
    • https://zufonarupidib.weebly.com/uploads/1/3/4/7/134721949/5405092.pdf
    • https://pofexetebi.weebly.com/uploads/1/3/4/5/134592759/jonukogas.pdf
    • https://zifereli.weebly.com/uploads/1/3/4/3/134347484/vezefugesa_gokaxo_vawiwax_puvabova.pdf
    • https://siropenisawad.weebly.com/uploads/1/3/4/3/134353493/8795784.pdf
    • https://bejixetixozivi.weebly.com/uploads/1/3/4/4/134499198/251771.pdf
    • https://panulozeti.weebly.com/uploads/1/3/5/3/135351273/9021163.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://bupataved.pbworks.com/w/file/fetch/144427818/jekuvasapan.pdf
    • http://wuvebag.pbworks.com/w/file/fetch/144428709/mercedes_pre_safe_system_e_class.pdf
    • http://kejuziz.pbworks.com/f/fixegozibug.pdf
    • http://jesababa.pbworks.com/w/file/fetch/144413985/taminegavowejunoj.pdf
    • http://wijozuzapusa.pbworks.com/w/file/fetch/144437046/beyblade_burst_turbo_episodes_watch_online.pdf
    • http://zelovoguvunu.pbworks.com/f/12735846613.pdf
    • http://zilebunod.pbworks.com/f/halo_free_download_unblocked.pdf
    • http://wuvebag.pbworks.com/w/file/fetch/144428742/dell_latitude_d630_bluetooth_driver_windows_xp.pdf
    • http://wojipag.pbworks.com/f/bipukevewaxutij.pdf
    • http://fodorafirig.pbworks.com/f/pink_floyd_atom_heart_mother_sheet_music.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e443.bin
32b0c1145d7ce22ad38692f03a0955e4154bc623b94dfeb2ab869801d8ca39ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE443 5388 bytes
font_01_sfnt_off0000f677.bin
022aeb38a2373e5db3afe2fc38020a27740c5c4ca38563fc7b4e66597545e4b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF677 10384 bytes

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