Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b8e0a282b3831a5…

MALICIOUS

PDF

68.8 KB Created: 2021-02-13 23:10:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 01111710e4feefc9c981bff2d9fece22 SHA-1: 063c64014c0b5c85e0542c9690e9734039035b9c SHA-256: 5b8e0a282b3831a5db1ba3d89abf02a3d1f58872663a8a71f4f12969cd49bfad
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV. It contains a large number of external links, indicating it functions as a link farm. The primary purpose appears to be directing users to potentially malicious websites, likely for phishing or to download further malware. No scripts were extracted, but the extensive link farm suggests an attempt to exploit users through external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://jacksth.ru/wix?keyword=assassin+vine+5e PDF link annotation
    • http://shoop-fk.ru/vebusowinoxejobimosa11v.pdfIn PDF document text
    • https://cdn.sqhk.co/daribugubive/y7cjdjg/16682231302.pdfIn PDF document text
    • http://aires.fun/penubugqn4i0.pdfIn PDF document text
    • https://cdn.sqhk.co/jefapukawore/dhierAA/46508810496.pdfIn PDF document text
    • https://cdn.sqhk.co/wujugojuse/8vXjd0I/81891171170.pdfIn PDF document text
    • https://cdn.sqhk.co/zedawuzijis/1PqA2us/nick_kart_racing_switch.pdfIn PDF document text
    • http://fb-ig-violation.com/dieta_creatinina_altarm5qh.pdfIn PDF document text
    • http://udilische.club/latest_odia_bhajan_song_free6qji5.pdfIn PDF document text
    • http://nubolutlion.xyz/simple_task_list_managerv6pxd.pdfIn PDF document text
    • http://levelupguild.com/panosigepoxalj7i1.pdfIn PDF document text
    • https://nebowepef.weebly.com/uploads/1/3/4/4/134483035/nadejake.pdfIn PDF document text
    • http://wusodopepufex.66ghz.com/billing_information_wrong_itunes.pdfIn PDF document text
    • http://eagleaff.com/pearson_algebra_2_workbook_answers2jhny.pdfIn PDF document text
    • http://cleaner-inn.club/fizawizoxpe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD167 4724 bytes
SHA-256: 7f7b68db32bead101e3d1f576240fe477d38d9d57100caea7c3ea8da0b2519b7
font_01_sfnt_off0000e199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE199 10916 bytes
SHA-256: 112f617b483aa15c413e6dbd46d69d75c151c1d32d9dffdd1e80b996b4addb33

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