Malicious PDF — malware analysis report

Static analysis result for SHA-256 83df91dd39944050…

MALICIOUS

PDF

73.1 KB Created: 2021-06-07 02:30:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 90d15177722f77b62155f4634d0651bb SHA-1: b9eaa2326e06aedcc6725b01b3d3191b9475bafc SHA-256: 83df91dd39944050422cec14bd4e32f21947d6d37698faf94888f11b184de74e
186 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document's content, presented as an 'injury report', is a common lure for phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://fokemale.ru/123?utm_term=ender+inciarte+injury+report PDF link annotation
    • https://bijupodenu.weebly.com/uploads/1/3/4/8/134894051/zosil.pdfIn PDF document text
    • https://vagezelez.weebly.com/uploads/1/3/0/8/130873856/02143d092.pdfIn PDF document text
    • https://lurugidapu.weebly.com/uploads/1/3/4/3/134315770/mazuvig-wowekegenalubo.pdfIn PDF document text
    • https://kubikogemovi.weebly.com/uploads/1/3/4/0/134095998/775404.pdfIn PDF document text
    • https://vibufimibe.weebly.com/uploads/1/3/0/7/130738819/3314646.pdfIn PDF document text
    • https://kelezisexuva.weebly.com/uploads/1/3/0/7/130739204/jinowe.pdfIn PDF document text
    • https://jatisarekitikez.weebly.com/uploads/1/3/4/6/134661612/65063c4021.pdfIn PDF document text
    • https://linefalaxig.weebly.com/uploads/1/3/2/6/132682404/5c684ffbc69f4.pdfIn PDF document text
    • https://delidenaluno.weebly.com/uploads/1/3/4/4/134438050/18ef9d03.pdfIn PDF document text
    • https://buzapakamewogu.weebly.com/uploads/1/3/4/3/134366326/515f38.pdfIn PDF document text
    • https://fulutikirulile.weebly.com/uploads/1/3/4/4/134471812/a35e6e87df00482.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/7bc8a3ba-a76e-4930-a905-4f5f8166719e/lezopedifulukikalavefiza.pdfIn PDF document text
    • http://nerobedevu.pbworks.com/f/wuxuzinizovubupusuwirevad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4617f466-8611-4c42-a0a8-e1128ce6ec75/ley_80_puerto_rico_resumen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5057c77e-2511-42bd-a847-6a2ecd759ac8/5289067307.pdfIn PDF document text
    • http://dadilotofexi.pbworks.com/w/file/fetch/144666507/does_whatsapp_work_on_desktop_without_phone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d27f9014-a1d6-4957-8ec7-d6b1553d068b/pixowuzilumorunudekur.pdfIn PDF document text
    • http://fudejob.pbworks.com/f/subject_verb_agreement_worksheets_intermediate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab92211f-6103-4e89-bdc7-476995748bcf/sigadif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4fdb672-deeb-4f91-a0fa-abfe1174574d/16.3_action_verbs_and_linking_verbs_practice_1_answer_key.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD232 4876 bytes
SHA-256: 36ff4fed548d3766c57a443e35eb85f2dcbff7598c438c5dec85d5a61df6bb72
font_01_sfnt_off0000e2d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D3 11316 bytes
SHA-256: 071ea4a286584ebb2dae035ddac7bc6f356b8a0055ef7d42b75b868969897539
font_02_sfnt_off0001094f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1094F 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2