Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4776cd2ecec7504…

MALICIOUS

PDF

61.5 KB Created: 2021-02-15 15:29:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 6162d1e7d5e2d933581475d60b9d92d4 SHA-1: 34ae2b10fb04cea8e7ffc3766f79567140c640a5 SHA-256: a4776cd2ecec7504d2eafef427ba3924fe8a8908c7aea67e5f4b182d1e187480
244 Risk Score

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/aws?utm_term=dunkin+nutrition+facts+iced+coffee In PDF document text
    • https://ziregorex.weebly.com/uploads/1/3/5/3/135351653/wazinabisadir.pdfIn PDF document text
    • http://copyright-helps-team.com/mupesujabewiducg1j.pdfIn PDF document text
    • http://help-igcopyright.xyz/renal_system_diagram_crossword_answersweuft.pdfIn PDF document text
    • http://websporizle4.com/dante_s_inferno_pc_kickassnzbc4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427780/normal_600ab61c85dd8.pdfIn PDF document text
    • https://wipevotabekux.weebly.com/uploads/1/3/1/6/131607119/5427571.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466664/normal_60254787f4032.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404503/normal_600d61121ef87.pdfIn PDF document text
    • https://tafanoxuxirugo.weebly.com/uploads/1/3/5/3/135327873/kudediwukape_melazus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407818/normal_600a24b3a0258.pdfIn PDF document text
    • https://fitelibisubun.weebly.com/uploads/1/3/3/9/133987071/0983debcc3bc.pdfIn PDF document text
    • http://bloodcraft.online/fezizidxozka.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/tarizirefevifab/tiwebuwod.pdfIn PDF document text
    • https://s3.amazonaws.com/zowejunef/litegokituvivit.pdfIn PDF document text
    • https://s3.amazonaws.com/fotojipifuzitul/96856910434.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_off0000b4a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4A3 5044 bytes
SHA-256: db239f8f68b3e9c5eb36b237246df1d5f023e9b5b0d97683dc27c9c5ad48ddeb
font_01_sfnt_off0000c5e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5E0 10400 bytes
SHA-256: 4e07b5e8b86fe91681f0f9afeabe670fb5325a5945ecad79364cc381096f128a

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