Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee3369477cf262cd…

MALICIOUS

PDF

109.5 KB Created: 2021-02-28 01:41:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 4b7759f8658c0048112c3ffc2dee6a7b SHA-1: 3d665f1af8299ed377a5e5b20d75d4c0dc46033a SHA-256: ee3369477cf262cdf57088491e9faeffedd0e3dce48ef99788ee57cc1ed1ba80
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, pointing to a link farm. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or malware distribution via these links. No scripts were extracted, but the presence of external URIs suggests an attempt to redirect the user to malicious 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://vilenefex.ru/wb?keyword=seat%20of%20the%20soul%20chapter%2012%20summary PDF link annotation
    • https://cdn.sqhk.co/xuxibila/wichjI4/6236758881.pdfIn PDF document text
    • http://magic-spring.com/what_is_a_good_offense_for_youth_basketball4mqhi.pdfIn PDF document text
    • http://xsafak.com/iobit_applock_pro_mod_apkbhm2l.pdfIn PDF document text
    • http://arevakar-travel.com/warranty_deed_minnesota_formu17hy.pdfIn PDF document text
    • https://cdn.sqhk.co/zaxuloxedu/R8oijeI/my_smart_house.pdfIn PDF document text
    • https://cdn.sqhk.co/nizivatitogu/7Wgixhb/zizamatemabonajojimapinom.pdfIn PDF document text
    • https://kigazodiraju.weebly.com/uploads/1/3/4/6/134678535/be37b790a64.pdfIn PDF document text
    • http://bilkan.fun/magic_rampage_secret_areas_1-_2wzibb.pdfIn PDF document text
    • http://verefdliyvtorogo.xyz/apostrophe_use_worksheet6ro9w.pdfIn PDF document text
    • https://cdn.sqhk.co/lewoxiguj/pjgihjh/emoji_craft_ideas.pdfIn PDF document text
    • http://ver-alex.website/byju_s_cracked_apkqltvt.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bupomejov.epizy.com/jobiwavovoguxuzapuli.pdfIn PDF document text
    • http://lagorov.rf.gd/vogige.pdfIn PDF document text
    • http://watekiz.rf.gd/myles_munroe_teaching_on_purpose.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwuzerijofa/subject_verb_agreement_worksheets.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_off00017006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17006 5644 bytes
SHA-256: 0d211a37525024397e905984a83fd2582894d416a35eda118065d15d5de91b83
font_01_sfnt_off00018327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18327 10988 bytes
SHA-256: e8a1511f549e3d3ec98ffaa486a1fa8eba5b8a6abf7fa5fdbdb77c5ff2adc0f7

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