Malicious PDF — malware analysis report

Static analysis result for SHA-256 83b50fa64df54376…

MALICIOUS

PDF

78.6 KB Created: 2021-03-20 14:55:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 6892a8cb640ce1e343c96b3fa82a4712 SHA-1: c3d2f682521a71abc421f741c0eb43bbb542242e SHA-256: 83b50fa64df54376dac675bd8aa0d5baf8d1578498691e0322b70956f52f2524
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, with one specifically pointing to 'fokemale.ru' and a query parameter suggesting performance upgrades. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed as a link farm on disposable hosting, further supporting a phishing or malware distribution lure. ClamAV detection as 'Pdf.Phishing.Trojan' confirms malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://fokemale.ru/123?utm_term=2017+audi+r8+v10+plus+performance+upgrades PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4426415/normal_5ffdb890f0330.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459621/normal_5fdfb9608f334.pdfIn PDF document text
    • https://cdn.sqhk.co/vopovaroxamo/1LZaohx/all-_in-_one_offline_maps_apk.pdfIn PDF document text
    • http://wapadax.scienceontheweb.net/beneke.pdfIn PDF document text
    • https://ruxibotululag.weebly.com/uploads/1/3/1/4/131408142/botodafo.pdfIn PDF document text
    • https://cdn.sqhk.co/nebemina/nha7ibO/kidoferoxejoriji.pdfIn PDF document text
    • https://topigofifudonif.weebly.com/uploads/1/3/5/3/135304546/zolagesatagol.pdfIn PDF document text
    • https://dorikorojuj.weebly.com/uploads/1/3/3/9/133987202/lusuvil.pdfIn PDF document text
    • https://cdn.sqhk.co/silinetufid/cicjgia/attendance_sheet_word_doc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404723/normal_5ff1e87faf93e.pdfIn PDF document text
    • https://cdn.sqhk.co/ribobujir/gjhwFRK/89008387442.pdfIn PDF document text
    • https://joworuzofoluj.weebly.com/uploads/1/3/2/6/132683209/naluwibunubiximej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415783/normal_6020f8f06ad8a.pdfIn PDF document text
    • http://nufivuzelikonax.getenjoyment.net/dikolavesanawidenekijog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365552/normal_603346b85111d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366367/normal_602f85eb69fcd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://josesomesube.myartsonline.com/asclepius_wellness_plan.pdfIn PDF document text
    • https://s3.amazonaws.com/zatasipezeg/18978957585.pdfIn PDF document text
    • https://s3.amazonaws.com/zatasipezeg/alimentos_altos_en_vitamina_c.pdfIn PDF document text
    • https://s3.amazonaws.com/nuvukivaxiren/how_fast_is_a_2021_kawasaki_mule.pdfIn PDF document text
    • https://s3.amazonaws.com/megodipewukitoj/zosoxisixozo.pdfIn PDF document text
    • https://s3.amazonaws.com/begijufadi/53293773278.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_off0000f0bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BB 6040 bytes
SHA-256: f3ff5c3815929e547bd73e4bc2cd3a6db40b69ba3477ee730d70a4711396d7c0
font_01_sfnt_off00010546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10546 11952 bytes
SHA-256: 03dfa882aa73c6e19aa8e8b3888130a0178bcb3cd88e543f4f82a8ca9255f04c

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