Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc18a96c7d59432e…

MALICIOUS

PDF

107.2 KB Created: 2021-04-09 03:08:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 93cd75dd9e4ae5acc7f1ceedfced266a SHA-1: eb51db62a27f17169923778eb276a86636d351de SHA-256: fc18a96c7d59432e1f3395540c4d4a6942f9394d3b83b5dfc902dd89aed8610f
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are hosted on disposable domains or link farms, indicating a likely SEO spam or phishing campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the presence of numerous external URIs points to an attack pattern focused on redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/strik?utm_term=digimon+world+3+kotemon+training+guide PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4480905/normal_5fe07151acb24.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499935/normal_602aa403bfb5a.pdfIn PDF document text
    • https://cdn.sqhk.co/vuxeneson/VTbIGUg/padibikufupijuwoz.pdfIn PDF document text
    • https://cdn.sqhk.co/tegiriwepaj/iA8jehd/16172818231.pdfIn PDF document text
    • https://cdn.sqhk.co/bikegola/4jf82gg/metrocast_digital_terminal_adapter.pdfIn PDF document text
    • http://pimupafigofud.iblogger.org/kakapozivasasowofe.pdfIn PDF document text
    • https://cdn.sqhk.co/soxuvezosapa/fiaojfR/never_ending_dungeon_idle_rpg_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483359/normal_5fd6e05c8f94c.pdfIn PDF document text
    • https://keregejuvuja.weebly.com/uploads/1/3/4/3/134345288/9147519.pdfIn PDF document text
    • https://salabupomisopef.weebly.com/uploads/1/3/4/6/134631393/672958.pdfIn PDF document text
    • https://sorefumegevori.weebly.com/uploads/1/3/1/8/131871670/jafid.pdfIn PDF document text
    • http://nefisexisaw.iblogger.org/nafavizodesiferoximunef.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/punagilelabon/19100996092.pdfIn PDF document text
    • http://rafoputoxuxu.epizy.com/how_do_i_connect_my_samsung_blu_ray_player_to_wifi.pdfIn PDF document text
    • http://debagejusuwaj.epizy.com/mazelerakelus.pdfIn PDF document text
    • http://jilawovo.epizy.com/cissp_braindump_2020.pdfIn PDF document text
    • http://sumidemeg.epizy.com/assam_police_si_recruitment_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/wajibile/76933525312.pdfIn PDF document text
    • https://s3.amazonaws.com/mamibis/88255648323.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_off0001672c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1672C 5284 bytes
SHA-256: c330e533a86853fa3a030194b1edd723b4839cdd50b786adb34afc5131647b74
font_01_sfnt_off00017926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17926 11152 bytes
SHA-256: d4e49fd74c010eac50269a5744dbf6e7605f7a8b0985598be802472d77e1dbea

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