Malicious PDF — malware analysis report

Static analysis result for SHA-256 333dc1bb07a9df18…

MALICIOUS

PDF

74.6 KB Created: 2021-06-01 01:52:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: adc570e743f6c89bc42445bc571944e4 SHA-1: 493c42b29d8977fb9f93ed635692b0f792b62c46 SHA-256: 333dc1bb07a9df184c9da0f37cdd5b4cce472aed5ca5e7d3d50e1851fb1535b0
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/pbw?utm_term=age+of+empires+2+multiplayer+internet+tcp%252Fip PDF link annotation
    • https://noxesole.weebly.com/uploads/1/3/4/6/134615833/zopuze.pdfIn PDF document text
    • https://titepusigob.weebly.com/uploads/1/3/5/3/135392267/7128209.pdfIn PDF document text
    • https://dumerozum.weebly.com/uploads/1/3/4/6/134611270/4597738.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478933/normal_60267bfa6cdaf.pdfIn PDF document text
    • https://nusomosuguxapo.weebly.com/uploads/1/3/4/6/134693055/b88e5f78e.pdfIn PDF document text
    • https://xujixokotejol.weebly.com/uploads/1/3/5/3/135308581/gupulusa.pdfIn PDF document text
    • https://soseriwu.weebly.com/uploads/1/3/4/8/134898980/safaroriwinunebaki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492918/normal_600f2cfa33f48.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4470221/normal_60b33a23edc3d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487399/normal_5fd14ec2df0f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456143/normal_6066ced59b92d.pdfIn PDF document text
    • https://zogadinarele.weebly.com/uploads/1/3/1/4/131409244/6098038.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://natizasex.pbworks.com/f/golf_buddy_voice_2_charging_instructions.pdfIn PDF document text
    • http://wuvebag.pbworks.com/w/file/fetch/144428778/solving_systems_of_equations_by_graphing_worksheet_answer_key_kuta_software.pdfIn PDF document text
    • http://taxexuwej.pbworks.com/w/file/fetch/144431379/descargar_seminario_reina_valera.pdfIn PDF document text
    • http://xalomuzavege.pbworks.com/f/79598272258.pdfIn PDF document text
    • http://xuruzinijub.pbworks.com/w/file/fetch/144429060/gexelasekalebofixefof.pdfIn PDF document text
    • http://togusan.pbworks.com/f/dragon_city_free_gems.pdfIn PDF document text
    • http://xalomuzavege.pbworks.com/w/file/fetch/144431244/how_to_identify_non_reducing_sugar.pdfIn PDF document text
    • http://xojifot.pbworks.com/f/mufegotoniziwexukajugub.pdfIn PDF document text
    • http://xetibubib.pbworks.com/f/little_johnny_what_does_a_pig_say.pdfIn PDF document text
    • http://nigezid.pbworks.com/f/what_are_the_different_story_structures.pdfIn PDF document text
    • http://sepaxebi.pbworks.com/f/citation_posie_didactique.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_off0000e57e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE57E 5596 bytes
SHA-256: d140d2d117291f786122ad21571bf077ff05409e3b2ce2ea3da7c3e8558717e4
font_01_sfnt_off0000f893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF893 10720 bytes
SHA-256: 961d4f92a949dc4ddb3034ddcbb3a1f227b5d02c26bf73f7d50d881cd2ea62b4