Malicious PDF — malware analysis report

Static analysis result for SHA-256 3816eadbc751c167…

MALICIOUS

PDF

76.5 KB Created: 2021-06-05 04:52:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cdeefc376dd6608985de7475ba04bf80 SHA-1: ab31eb21a2cdcecce3be13e741ae73a5e9e0ee39 SHA-256: 3816eadbc751c167c7b9cfbe56f764d74f72f575d37317c2c1758acfe4a617e5
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, pointing to various PDF files hosted on Weebly and other platforms. This behavior is indicative of SEO manipulation or a phishing campaign distributing malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

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://ketchas.ru/pbw?utm_term=the+odyssey+part+1+test+pdf
    • https://sizazadumaf.weebly.com/uploads/1/3/1/3/131398154/jufunavu.pdf
    • https://vawuzusafut.weebly.com/uploads/1/3/4/8/134863851/5846153.pdf
    • https://talipugetajizan.weebly.com/uploads/1/3/4/8/134862074/posupo-xefofagivumepuz-lesugesa.pdf
    • https://guzoxufogoxuwo.weebly.com/uploads/1/3/4/0/134097696/lomapuro_fubebapawu_pafakamuwub.pdf
    • https://nifudosuv.weebly.com/uploads/1/3/4/0/134040563/1954226.pdf
    • https://dasewukux.weebly.com/uploads/1/3/5/9/135956745/57728a6ab1a84.pdf
    • https://dikabapor.weebly.com/uploads/1/3/4/6/134620412/9391976.pdf
    • https://rimokukesezawuk.weebly.com/uploads/1/3/1/4/131437069/wurutada.pdf
    • https://dobibumalo.weebly.com/uploads/1/3/1/0/131070161/407281e20c0.pdf
    • https://tisexazom.weebly.com/uploads/1/3/2/6/132682329/1695750.pdf
    • https://pofekabebo.weebly.com/uploads/1/3/0/7/130739116/2302491.pdf
    • https://rutujuxifir.weebly.com/uploads/1/3/4/6/134632780/d5c2c4c51478.pdf
    • https://wefolukozik.weebly.com/uploads/1/3/1/4/131406413/5d3bb05e7d.pdf
    • https://wewofubajibopa.weebly.com/uploads/1/3/1/3/131381003/7170759.pdf
    • https://mizevazorabij.weebly.com/uploads/1/3/5/3/135347525/3245199.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/7ad55c87-888f-4645-aad7-ddc2728e1003/telivezevasenel.pdf
    • http://xugilip.pbworks.com/f/what_size_belt_for_a_craftsman_lt2000.pdf
    • http://zanikofepaj.pbworks.com/f/how_to_wear_letscom_fitness_tracker.pdf
    • https://uploads.strikinglycdn.com/files/8f415039-695d-4bc0-974b-9db1ed672c04/dezifiditi.pdf
    • https://uploads.strikinglycdn.com/files/981f0ea7-a65d-4d7f-b6c0-a945fa3a684a/will_there_be_a_red_rising_book_6.pdf
    • https://uploads.strikinglycdn.com/files/fd454102-3b7b-46e2-8b58-22979551cb99/systems_of_inequalities_problems_answers.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_off0000ed3c.bin
728b0aceb4d8b064c83135f928e620481fd275aeb760c29be8179b98c5c2fe84		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED3C 5200 bytes
font_01_sfnt_off0000fef1.bin
27ae68de2a65d480b67886903243618458a76ed84c0886686169351259d278d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF1 11200 bytes

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