Malicious PDF — malware analysis report

Static analysis result for SHA-256 188731faedec65e6…

MALICIOUS

PDF

71.2 KB Created: 2021-03-12 19:07:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3b41b83d9815ff111ca3eac452ad2a90 SHA-1: 53bcd25b900e46bd903abba740e910293ab53cc6 SHA-256: 188731faedec65e696f207524609916657f33eeafe7a7c6c01e0dae95a576616
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 0.9991

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://xajibur.ru/wix?keyword=isuzu+ftr+owners+manual PDF link annotation
    • https://xepolilibud.weebly.com/uploads/1/3/4/5/134591261/nibewepukoned.pdfIn PDF document text
    • https://mifajuga.weebly.com/uploads/1/3/4/7/134732675/tajad_mijirupa.pdfIn PDF document text
    • https://bowineno.weebly.com/uploads/1/3/4/8/134868267/4682000.pdfIn PDF document text
    • https://tusukufuduma.weebly.com/uploads/1/3/4/4/134458322/7687679.pdfIn PDF document text
    • http://lumapon.iblogger.org/flutter_box_decoration_cheat_sheet.pdfIn PDF document text
    • https://pogunokele.weebly.com/uploads/1/3/0/7/130739789/c52e9b23e7e2.pdfIn PDF document text
    • https://pimakesoxokozo.weebly.com/uploads/1/3/4/0/134041299/loxomarikilov_nikafegaz_dezonebekafopij_wilenuwokodi.pdfIn PDF document text
    • http://kexisugotiro.22web.org/46050216390.pdfIn PDF document text
    • http://gayerkan.com/pabezangjw8q.pdfIn PDF document text
    • http://pshcomonhere.xyz/staphylococcus_aureus_diseasesgmv5k.pdfIn PDF document text
    • http://rapugazif.22web.org/6750675961.pdfIn PDF document text
    • https://fukorolavo.weebly.com/uploads/1/3/4/6/134639224/4548846.pdfIn PDF document text
    • https://welavomuwaj.weebly.com/uploads/1/3/4/6/134633166/ab14b0d.pdfIn PDF document text
    • http://bikupiribofaz.iblogger.org/dyson_dc35_animal_instructions.pdfIn PDF document text
    • http://cherrypimp.online/motapagosujol3x.pdfIn PDF document text
    • https://melinifijegor.weebly.com/uploads/1/3/4/2/134265386/c74313e2fd193b8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9e9203d9-9f5b-42f2-a849-05e42d741f90.filesusr.com/ugd/3527d5_b9a8de706d2e4d1d92d53556281de2ce.pdf?index=trueIn PDF document text
    • https://6d251753-49d0-4f5b-a278-10ed1cacc9d0.filesusr.com/ugd/5c139a_a5244685ae30410da34b9a911cf37a7b.pdf?index=trueIn PDF document text
    • https://980d5d87-1fe7-42cd-8593-612f53075a19.filesusr.com/ugd/738632_5156be2715544de396243ee1bcbd61af.pdf?index=trueIn PDF document text
    • https://c84ffda1-e72a-45fa-8ce8-a771970cf326.filesusr.com/ugd/9fd656_93c0638612124116a9475cb00f9b594b.pdf?index=trueIn PDF document text
    • https://3568c1c9-c281-4b9a-9ea9-d5d291e0176b.filesusr.com/ugd/e5d8db_31f34b2a69b8461fb7094e53851c0bce.pdf?index=trueIn PDF document text
    • https://60659a61-a27b-47ea-8eac-a81775c62269.filesusr.com/ugd/7a7fb1_ffd6ff6bc7e44f688043c83e07febbcd.pdf?index=trueIn PDF document text
    • https://d5aacb37-8766-4234-9cc8-c2ec3b911aba.filesusr.com/ugd/1e723b_5497ba97c15d452386e9292f1ec6b46d.pdf?index=trueIn PDF document text
    • https://0dd0cd87-80d3-4eb5-b9c6-73c43c3a6fca.filesusr.com/ugd/f0b6b3_7fbb11dd4f6e481782dbed3ada3055be.pdf?index=trueIn PDF document text
    • http://fagorawed.rf.gd/ts_icet_allotment_order_2018.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_off0000db98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB98 4992 bytes
SHA-256: 8c46d07544d84f4a1be807a0f00ff38a286a0e2195286d7f08500b3650ba3cc9
font_01_sfnt_off0000ec93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC93 10240 bytes
SHA-256: c1ad9f0f7d23ce77894d91ed1a3c27e5db198abc31551d34eeef09d1e3cdc959