Malicious PDF — malware analysis report

Static analysis result for SHA-256 023705f092a2ed7d…

MALICIOUS

PDF

87.8 KB Created: 2021-03-10 14:37:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 2f5172b1d4b8533e61c3832ba62743f5 SHA-1: 065d9e53a5621fe1e6dab6091edc7dd47042d481 SHA-256: 023705f092a2ed7d30ee34d16f7d954bd51717bfc52089026654ceb9458ea101
126 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting or link farms, indicating a likely attempt to redirect users to malicious sites. The PDF structure and embedded content suggest it is designed to appear as a document but ultimately serves to facilitate malicious redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://xajibur.ru/award?keyword=articles+of+organization+ny+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4487197/normal_603bece059c7e.pdfIn PDF document text
    • https://cdn.sqhk.co/bogovureg/ie9TiiI/bozomusalebik.pdfIn PDF document text
    • https://cdn.sqhk.co/xenivoronizu/iahiLgc/networks_vocabulary_builder_activity_the_constitution_answer_key.pdfIn PDF document text
    • https://cdn.sqhk.co/gukokefa/ghvz9Ri/police_scanner_close_to_me.pdfIn PDF document text
    • https://cdn.sqhk.co/birenejar/ttTibgh/63891567208.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381546/normal_6015c21b13575.pdfIn PDF document text
    • https://cdn.sqhk.co/sovixojer/hhtM4ji/when_did_daytona_race_on_the_beach.pdfIn PDF document text
    • https://cdn.sqhk.co/timadupak/gDrb25d/simple_cake_decorating_ideas_with_icing.pdfIn PDF document text
    • http://balifruit.com/6471150016253yq1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471252/normal_603489f02f651.pdfIn PDF document text
    • https://cdn.sqhk.co/xizefonuma/IM6gegi/at_t_business_account_number.pdfIn PDF document text
    • http://prizinsta.info/9620758065656v29.pdfIn PDF document text
    • http://yourlivehelp.com/english_learning_games_for_secondary_studentsx2ll5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gezixus.myartsonline.com/3d_interior_design_software_for_mac.pdfIn PDF document text
    • http://guseboses.atwebpages.com/organic_chemistry_2_lecture_notes.pdfIn PDF document text
    • http://kepagewav.atwebpages.com/xovabasawopevisu.pdfIn PDF document text
    • http://xodepew.epizy.com/realidades_2_capitulo_8a-_9_answers.pdfIn PDF document text
    • http://mivuturirem.rf.gd/ikea_desk_micke_manual.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_off00011bc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC5 5464 bytes
SHA-256: 426d884748a8e0e5b23b68c36633abee75dece3873250dc8597b38f4a2f642e3
font_01_sfnt_off00012e7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E7C 10428 bytes
SHA-256: b8c59c3b15ec834a12fa15316926db199782a6628eb9f6a0265e730fced33faf

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