Malicious PDF — malware analysis report

Static analysis result for SHA-256 4994c49894a7f328…

MALICIOUS

PDF

67.5 KB Created: 2021-06-11 04:36:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c1f337711058ddca1a166f742a88ebe SHA-1: 7bbeb431d622a1081121ee7d2a36e678dd295bfc SHA-256: 4994c49894a7f328cf9ee0e05d0aff2cbf572233ab4b24e25a0a9ffc2c954918
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO manipulation tactic. The presence of a critical ClamAV detection and ML classifier flagging indicates malicious intent, likely related to phishing or malware distribution. The primary external URI, 'https://ketchas.ru/pbw?utm_term=dil+lagaya+tha+dillagi+ke+liye+song', is suspicious and likely serves as a lure or redirection point.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://ketchas.ru/pbw?utm_term=dil+lagaya+tha+dillagi+ke+liye+song
    • https://cdn-cms.f-static.net/uploads/4481170/normal_6049bdb3b40ff.pdf
    • https://cdn-cms.f-static.net/uploads/4494430/normal_601db04ad3ed5.pdf
    • https://gorasugaki.weebly.com/uploads/1/3/4/7/134766712/ratonobepopak.pdf
    • https://getiwojaxewife.weebly.com/uploads/1/3/4/0/134012456/pujeziwiw-keriti-tagikazebu.pdf
    • https://cdn-cms.f-static.net/uploads/4495392/normal_603e408bd84f2.pdf
    • https://tadafami.weebly.com/uploads/1/3/4/3/134386911/5651de7c6e05c2d.pdf
    • https://cdn-cms.f-static.net/uploads/4401983/normal_60581d413ff88.pdf
    • https://cdn-cms.f-static.net/uploads/4481516/normal_6031e8651bd3b.pdf
    • https://cdn-cms.f-static.net/uploads/4413987/normal_6017ae69efd84.pdf
    • https://cdn-cms.f-static.net/uploads/4419822/normal_600a499a48087.pdf
    • https://cdn-cms.f-static.net/uploads/4410695/normal_60bfe08be54b0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/04cff9e0-586a-467e-bc57-aa850a67366e/acer_aspire_one_netbook_battery_replacement.pdf
    • https://uploads.strikinglycdn.com/files/d1ba6276-e5b6-4105-b7cf-75e2ece82639/73779715588.pdf
    • http://xudusuvo.pbworks.com/f/mimoxosabenifumut.pdf
    • https://uploads.strikinglycdn.com/files/602b59fd-2556-4867-b74a-9931efb969d0/setilufikagewabif.pdf
    • http://wekibivu.pbworks.com/w/file/fetch/144476700/industrial_and_organizational_psychologist_masters_degree_salary.pdf
    • https://uploads.strikinglycdn.com/files/e93e185f-2d4d-4f7b-9369-992c13734e5e/sujatimubipezanilif.pdf
    • https://uploads.strikinglycdn.com/files/dbd06656-119d-4e9c-85cb-ea1b0c24880d/42711031475.pdf
    • https://uploads.strikinglycdn.com/files/d646bfbf-4e98-4874-9f7f-6219470041fe/56358553293.pdf
    • http://gosavepifij.pbworks.com/w/file/fetch/145097859/mario_kart_mod_apk.pdf
    • https://uploads.strikinglycdn.com/files/51f90cba-70e3-4962-8d5c-5973f1522c85/how_much_does_young_living_cbd_oil_cost.pdf
    • http://guzopisuw.pbworks.com/w/file/fetch/144618051/les_fourberies_de_scapin_analyse_5me.pdf
    • http://funuvutidip.pbworks.com/w/file/fetch/144468348/ingles_iii_prepa_abierta.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_off0000cc52.bin
376aac19cbcda5a61a0bcbb67ac344642dd0837b9bc1c876d15502854902a447		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC52 5156 bytes
font_01_sfnt_off0000dde8.bin
5455b328b2e132e863776690b727aac341e094ec7226d77f4ad73797278dac45		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE8 10116 bytes

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