Malicious PDF — malware analysis report

Static analysis result for SHA-256 87601cd1a753e72f…

MALICIOUS

PDF

75.4 KB Created: 2021-04-29 02:20:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e8bf64162cd5fa59cfd56f42293f72d6 SHA-1: a90ae36d94a6fd7b00c89ff1a2d7cdf106b38246 SHA-256: 87601cd1a753e72faa5d4b0b23527699ad13188350fb42e3b2f17420ff2fffe0
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm, with the primary malicious URL being dafemum.ru. This suggests the document is designed to redirect users to potentially malicious sites, likely for phishing or to download further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dafemum.ru/strik?utm_term=does+stefan+end+up+with+elena+in+the+books
    • https://cdn.sqhk.co/zakoduba/d7mjeMZ/43231122194.pdf
    • https://static.s123-cdn-static.com/uploads/4377931/normal_5fccd23cdd7ff.pdf
    • https://cdn.sqhk.co/rotonoba/a147xuZ/zixiwonopif.pdf
    • https://momuxubodi.weebly.com/uploads/1/3/1/3/131379397/3781834.pdf
    • https://jowukore.weebly.com/uploads/1/3/4/8/134870909/f7d2b00.pdf
    • https://cdn.sqhk.co/romilononove/IjdOzXm/diamond_minecraft_sword_make.pdf
    • https://cdn.sqhk.co/sezogitov/gheKgcK/vozesugefasegeki.pdf
    • https://jironomazubem.weebly.com/uploads/1/3/5/3/135393756/befafebawulab.pdf
    • http://xixofafil.medianewsonline.com/tafsir_al_quran_indonesia.pdf
    • https://cdn.sqhk.co/lepezusija/aNgfKia/ruxati.pdf
    • https://cdn-cms.f-static.net/uploads/4382961/normal_6030f6023c31a.pdf
    • https://static.s123-cdn-static.com/uploads/4408862/normal_5fc6dea9e9f7e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://d5e9a058-cbdc-4968-ba72-30cdbf1e36a3.filesusr.com/ugd/9cfd0a_d1bf31a5fb32460f93eb1e3c5b732781.pdf?index=true
    • https://s3.amazonaws.com/tiduro/4019746846.pdf
    • https://f85e9a30-dbb9-40fd-a66d-53bd7daafe07.filesusr.com/ugd/1b9faa_e102b35c5bcb4810a02e539f1aaa46f1.pdf?index=true
    • https://s3.amazonaws.com/nefomojuwet/venta_airwasher_cleaning_solution.pdf
    • https://s3.amazonaws.com/xixonu/how_to_write_a_good_romantic_novel.pdf
    • https://s3.amazonaws.com/vexosafugunu/29516038475.pdf
    • http://kofepiropi.onlinewebshop.net/bowepasotokova.pdf
    • https://s3.amazonaws.com/vifusupegiza/peoples_sexiest_man_alive_2018_list.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea26.bin
6cd4be2a8f97508545ce32613dd1fa25f4e5dcbcecde5375b8e0a71f635afe19		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA26 5328 bytes
font_01_sfnt_off0000fc5d.bin
ec851ebefc4763717b840cbb48d87ec1a3fe8d1431b18693a50875aa4562c685		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5D 10520 bytes

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