Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ca00cab11c8e7ff…

MALICIOUS

PDF

82.4 KB Created: 2021-01-09 16:34:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: c449fa2b7aefa52b85f65406437f6f04 SHA-1: d4245c1405a6bb51d6127070e8fc1f729346e830 SHA-256: 4ca00cab11c8e7ff783abef6ac1c4cb2ba9fa5989d99ca359498ef5a3b7e8c2b
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 of which point to seemingly benign files but one suspicious URL (traffset.ru) is present. The ClamAV detection and ML classifier strongly indicate maliciousness, with the PDF_SEO_LINK_FARM heuristic suggesting a link farm for SEO manipulation or malware distribution. No scripts were extracted, but the presence of numerous external links suggests an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://traffset.ru/123?utm_term=role+strain+vs+role+conflict PDF link annotation
    • https://lagonola.weebly.com/uploads/1/3/4/8/134851586/6617644.pdfIn PDF document text
    • https://nubagusajol.weebly.com/uploads/1/3/4/2/134235051/bibeb.pdfIn PDF document text
    • https://regogugone.weebly.com/uploads/1/3/4/8/134891767/pekek.pdfIn PDF document text
    • https://wonikisemuk.weebly.com/uploads/1/3/4/9/134902350/lubetutaba.pdfIn PDF document text
    • https://puzalanenezow.weebly.com/uploads/1/3/4/6/134693659/wiwekufedivutav_pekomobedefaw_tuvofebipud.pdfIn PDF document text
    • https://rupimobo.weebly.com/uploads/1/3/4/8/134891389/tikun.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kotenu/project_management_network_diagram_template_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/getizar/bittorrent_pro_apk_apkpure.pdfIn PDF document text
    • https://s3.amazonaws.com/fukepez/duck_life_unblocked_games_world.pdfIn PDF document text
    • https://s3.amazonaws.com/jefobexapulow/messagerie_hotmail_outlook_se_connecter.pdfIn PDF document text
    • https://s3.amazonaws.com/juliziwojatige/outkast_aquemini_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79b856e2-06a2-4326-b4e0-6d687dafaf50/cass_community_services.pdfIn PDF document text
    • https://s3.amazonaws.com/tasufagijaremo/73867402516.pdfIn PDF document text
    • https://s3.amazonaws.com/lovomijelun/26378034356.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa7f08c3-a72f-4d2e-8ebe-f3a6f3b2a4f9/the_bucket_list_family_cartoon_jobs.pdfIn 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_off000106b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B8 4940 bytes
SHA-256: 5e6feef38ab1963529792c07fd925793a50ad175aced10ca0c6098a01df1588e
font_01_sfnt_off0001179d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1179D 10856 bytes
SHA-256: 9ca67eb80185f0ff2ec73851005bece4fc2f5be9698a7c8bb7034f269a9e8822

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