Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a2ddf6007e04667…

MALICIOUS

PDF

67.6 KB Created: 2021-03-18 16:11:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 16cb87665d93f9194e5fc846cde6217a SHA-1: c2ed816f41d388868adf831fa99cffd1c18bb02e SHA-256: 7a2ddf6007e04667503d288c84b182c2ed64d48584931a2ee243eee0b6928e3c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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://xajibur.ru/award?keyword=full+year+calendar+2020+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4388406/normal_600204891b6f2.pdfIn PDF document text
    • https://cdn.sqhk.co/litigoruf/ghRS8JK/car_driving_games_download_uptodown.pdfIn PDF document text
    • https://cdn.sqhk.co/senuziker/edggIHP/dumb_charades_meaning_in_urdu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476783/normal_5ff75c7016b35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411681/normal_603af05e71d18.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495854/normal_604381f0bcbf0.pdfIn PDF document text
    • https://cdn.sqhk.co/duputokodoz/hijdhes/41570939827.pdfIn PDF document text
    • https://cdn.sqhk.co/vuvesanap/bcERlMS/jatewupafozewudeg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443814/normal_5fcc920e80eb8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450350/normal_5fe07bf688b79.pdfIn PDF document text
    • http://zowisofefo.iblogger.org/tatode.pdfIn PDF document text
    • https://cdn.sqhk.co/mitejapeki/gjhauhf/75142939323.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423780/normal_6042c810ba0d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469831/normal_6027fbd9bf789.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450727/normal_5fdebdf0e416f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402712/normal_5fe5daeb18d25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379987/normal_604aef1330860.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e02212b7-c8ec-4bf5-ba3e-d68a1de675e0.filesusr.com/ugd/7f1d73_91e545bbc22e47548810e4f26cc72d46.pdf?index=trueIn PDF document text
    • http://xesijapapun.rf.gd/6006706689.pdfIn PDF document text
    • https://441768bb-9839-4df4-8f78-dd1233b527f6.filesusr.com/ugd/7e6080_33a04d37645f4c04b460820256f3758b.pdf?index=trueIn PDF document text
    • http://vefobop.epizy.com/5079817006.pdfIn PDF document text
    • https://c145ee04-3c3b-4786-8b94-e0511401b322.filesusr.com/ugd/de65f7_b5c885b0c9f341eaa07999c4722ee216.pdf?index=trueIn PDF document text
    • https://1cd0d4d5-11d4-440c-a307-81f73801f601.filesusr.com/ugd/f0e51d_795a7578d5f148449c3e8986c6d50472.pdf?index=trueIn PDF document text
    • https://146c8b6c-0b46-450b-8ed0-b45f1e2a4974.filesusr.com/ugd/b58d21_e1f56251287f4f1e8e78260d94bff518.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD07 5304 bytes
SHA-256: bc1795ff20f786c2a421e17b3974977b3e24d95749cbcbcef956f05fa3a71841
font_01_sfnt_off0000df2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2B 9860 bytes
SHA-256: 808b0645a0c5018ceda8da1ea7d4b891b3e0e4cbf4e88b4552f82f5287637a2e