Malicious PDF — malware analysis report

Static analysis result for SHA-256 33a9f00865c565ba…

MALICIOUS

PDF

113.0 KB Created: 2021-04-17 00:07:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: abb612b97afca3311e8a41ed9e496b0c SHA-1: 8d997b9dc7d6ea40d2cc5b5d06b992942e9996a6 SHA-256: 33a9f00865c565bac1733b33479931f5c5f8ffaceddabfe62220e0456dba9102
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 0.9995

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://dugedepap.ru/strik?utm_term=sub+zero+650+service+manual PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4417024/normal_5fce9b1e12208.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxofidipo/Xm0jdii/44152698822.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405638/normal_5fcb41aacd816.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380700/normal_5fd3265f8b124.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427080/normal_606780324839f.pdfIn PDF document text
    • https://cdn.sqhk.co/pasivuzuke/JH8ggjb/gomazimixogurutoronupoz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422631/normal_5fe5a687d6956.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448735/normal_604aec66e927e.pdfIn PDF document text
    • https://cdn.sqhk.co/fugovigul/3Mig3LX/mods_builder_for_minecraft_pe_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7e574f8b-ef34-4833-8dee-b18f3ac9fc91.filesusr.com/ugd/af8ffd_f6aa89aa38dc4ca6855ffa4c4b61e0fe.pdf?index=trueIn PDF document text
    • https://ce3a146a-d504-4efb-981c-4593fb85d965.filesusr.com/ugd/5b5da7_b67916d7ad6a4afe82dddc3b884df0fe.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a27eb353-cf7b-42d8-a35b-be8ad7c93bc5/29535933151.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/195e7708-f7b4-4a5b-a99a-10cc6dd94f17/what_gluten_free_cant_eat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc389a1b-1829-470b-9906-c156eff60f36/scratch_maze_game_tutorial_youtube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5ef9a99-656a-4ce4-a0e2-c54915d2fc90/pigisagalubeta.pdfIn PDF document text
    • https://b32521b7-32ca-447e-9967-d27d0dce683d.filesusr.com/ugd/800b88_491668915ffc4e55a7cb6ebab2927a8b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/womirofop/how_to_fix_ipad_keyboard_not_working.pdfIn PDF document text
    • https://s3.amazonaws.com/dovulavavo/38020893133.pdfIn PDF document text
    • https://2a04f01a-7147-4793-98aa-b59dc93e6f96.filesusr.com/ugd/efcdeb_8efec1e2f0a34816b5b39b334f9859ca.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9e300bf-de66-41b9-b1c4-bb350bc682ce/area_calculation_formula_for_trapezoidal.pdfIn PDF document text
    • https://b1c30c75-ab46-439a-884d-3836ae4b8a49.filesusr.com/ugd/2d1648_1b97fa243e12412cad435bb6447d4bbb.pdf?index=trueIn 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_off0001816a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1816A 5720 bytes
SHA-256: 75a914ce0211b871a27f282783bc258acd96b17942df0a67b5084fb7c878bad3
font_01_sfnt_off000194da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x194DA 9824 bytes
SHA-256: dca402a596bd3699b337b6e8cbde828e9b2ec5150675e96a7e53630915b2d703