Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2dc035c5935644a…

MALICIOUS

PDF

68.8 KB Created: 2021-03-10 05:01:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 02bc80fa0d09acac8953c53a95d9620f SHA-1: 0f223ff72ec3938069762c7956392eaba88c4aa5 SHA-256: c2dc035c5935644a50d531185acaa5c37056042948e05174d9fa4a863d185e68
186 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, identified as a link farm, with the primary URL suggesting a phishing or SEO scam. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially malicious or phishing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://zajinet.ru/award?keyword=ccsap+2020+pdf PDF link annotation
    • http://astrology-personal.online/where_did_the_butterfly_knife_originated37lkn.pdfIn PDF document text
    • https://vevikonupefafo.weebly.com/uploads/1/3/5/3/135391347/sumane.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420604/normal_6015da8c4c59c.pdfIn PDF document text
    • https://logomeso.weebly.com/uploads/1/3/1/4/131438572/xazib.pdfIn PDF document text
    • https://juvikawupuw.weebly.com/uploads/1/3/1/4/131409017/kirenatu-jadase.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406456/normal_5ffd72b896469.pdfIn PDF document text
    • http://modernstyle.pro/puxukugazafabedixm3pu9.pdfIn PDF document text
    • https://wetusaseri.weebly.com/uploads/1/3/5/2/135297966/nezafexerufogen.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499995/normal_5ff08e77f0349.pdfIn PDF document text
    • https://cdn.sqhk.co/lisupixiwe/tKhdjdH/4415406775.pdfIn PDF document text
    • https://cdn.sqhk.co/wujukipako/ggiekJS/baby_word_cookie_cutter_and_stencil.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378853/normal_5ffd81ed230ea.pdfIn PDF document text
    • http://bunnygummy.ru/7239291097031q4e.pdfIn PDF document text
    • https://cdn.sqhk.co/juvekuvop/gjjihgh/mesumatubotewoz.pdfIn PDF document text
    • https://gavanigo.weebly.com/uploads/1/3/1/3/131380609/2247124.pdfIn PDF document text
    • http://girlita.space/periodic_trends_electronegativity_worksheet_answer_keyzjc99.pdfIn PDF document text
    • https://vabakapis.weebly.com/uploads/1/3/1/4/131453405/6570684765ad9.pdfIn PDF document text
    • https://bibatuzasofobi.weebly.com/uploads/1/3/4/8/134879938/6551572.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387922/normal_5fcb961f367e0.pdfIn PDF document text
    • https://cdn.sqhk.co/zudatona/0ggjdWG/microsoft_teams_app_for_laptop_32_bit.pdfIn PDF document text
    • http://leopolds.space/rem_its_the_end_of_the_world_lyrics_chords2w0pi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d4f4546a-a836-4b3d-8651-c56b89608eca.filesusr.com/ugd/3e9e83_92764c9e1627478b970a910eaceb42f1.pdf?index=trueIn PDF document text
    • https://6593eeda-10fe-4128-810f-cbbc79f0a4f8.filesusr.com/ugd/c0a4bf_c772c58e22b34c83bc86355f579da83e.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_off0000d39e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD39E 5200 bytes
SHA-256: 5503a9df3cff1fab3628085c0154f4fecfd00b19e2bd0402ebc5ef6ec5bbd226
font_01_sfnt_off0000e565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE565 9640 bytes
SHA-256: 8453603259ccdbfc75ad69df100b292d292ae2225fdc2d2ef4219ae6df11cca3