Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f690a8e81bec068…

MALICIOUS

PDF

75.4 KB Created: 2021-03-29 00:50:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9c43d38c21e85048056053d45060680d SHA-1: 7b20634d27594a3e928824182c7c7dca2daaa1ba SHA-256: 8f690a8e81bec068a561219e560ce8678984ff163a6f96e69e0ca5db79135067
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent URL pointing to a domain associated with phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to software download issues, aiming to trick users into clicking the malicious link.

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://ponafet.ru/strik?utm_term=sims+3+won%2527t+download+on+origin
    • http://xuxikanewojolaj.22web.org/90176000814.pdf
    • https://gilaxisob.weebly.com/uploads/1/3/1/4/131406303/3c659.pdf
    • https://cdn.sqhk.co/rowojazur/iflWzC1/kaxosukulibogus.pdf
    • https://ramageputa.weebly.com/uploads/1/3/1/6/131637054/6048430.pdf
    • https://vojutodebol.weebly.com/uploads/1/3/4/0/134096580/790df50bc53c93.pdf
    • https://cdn.sqhk.co/lakanodip/cEiWoX3/neromuvorizulob.pdf
    • https://kigolakelo.weebly.com/uploads/1/3/1/3/131380934/xobisib-nixirole-fuwezejifonu.pdf
    • https://xubuzibapuvuzen.weebly.com/uploads/1/3/4/6/134611254/5777154.pdf
    • https://cdn.sqhk.co/tutabalero/Fgii2Vt/gepakipokutagezoxilu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/17da9e5e-1899-4948-b5aa-fd249b781afc/rotafimikifububivetevowi.pdf
    • https://s3.amazonaws.com/tuzamada/barrick_gold_earnings_report_date.pdf
    • https://s3.amazonaws.com/jolunenafobuw/8077833851.pdf
    • https://uploads.strikinglycdn.com/files/5e9260b1-9314-4113-ae1e-43783b4b1782/is_it_normal_for_couples_to_have_arguments.pdf
    • http://sonasekofuxix.rf.gd/activesheet._shapes_excel_vba.pdf
    • https://uploads.strikinglycdn.com/files/5fbe76d8-c232-45a9-856d-93de27b4fd63/what_intermolecular_forces_are_present_in_ch3f_and_cf4.pdf
    • https://uploads.strikinglycdn.com/files/c218a02d-9363-4387-bb59-e676509c4d9e/braun_ear_thermometer_lens_filters_40_pack.pdf
    • https://uploads.strikinglycdn.com/files/bb879de4-fd47-4ad8-8b86-addcd63d97a3/how_to_program_remote_to_cable_box_xfinity.pdf
    • http://tatikipebufufa.epizy.com/does_target_have_bathroom_scales.pdf
    • https://uploads.strikinglycdn.com/files/8eed435b-d3eb-4ad7-91ca-1d2bd61580ac/dawolimijatu.pdf
    • https://s3.amazonaws.com/dixaleko/safe_bittorrent_sites.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_off0000e836.bin
ca231442b84f6c000b5df6fc2ae4f5338407dde315e153398067fdd3d40cb6c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE836 5540 bytes
font_01_sfnt_off0000fb05.bin
abe1fff05bd8ce83086b08082b698491c8b577277e163134fcb4454e89e273db		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB05 10952 bytes

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