Malicious PDF — malware analysis report

Static analysis result for SHA-256 f842c36fc275c314…

MALICIOUS

PDF

74.6 KB Created: 2021-01-18 22:52:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 06ffc6c312f2f74acd352d0052beea75 SHA-1: 7914245ad1fbc02449c264d7a2d20bc0e5d561d7 SHA-256: f842c36fc275c31420223e7df4bd5402ec712f8e16b9c0845ea0fb499675461d
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links pointing to external PDF files hosted on disposable domains, a technique often used for SEO manipulation or to distribute malware. One critical heuristic identified a link to known malicious redirector infrastructure, and ClamAV detected the file as 'Pdf.Phishing.Trojan'. The document body is heavily obfuscated and appears to contain metadata rather than user-facing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/123?utm_term=synonym+for+duty+assignment In PDF document text
    • https://mesifadenox.weebly.com/uploads/1/3/4/1/134108947/87e78abf33.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475380/normal_5fb60d94188ea.pdfIn PDF document text
    • https://site-1175307.mozfiles.com/files/1175307/dead_samurai_2_cheats_list.pdfIn PDF document text
    • https://wugepugozufov.weebly.com/uploads/1/3/4/7/134744675/tazufotuvum.pdfIn PDF document text
    • https://site-1201164.mozfiles.com/files/1201164/burokulijefozigugot.pdfIn PDF document text
    • https://site-1174202.mozfiles.com/files/1174202/counter_terrorism_unit_jobs_birmingham.pdfIn PDF document text
    • https://nifirasevaxo.weebly.com/uploads/1/3/4/7/134756957/sivoxuwono-fepim.pdfIn PDF document text
    • https://fidevawane.weebly.com/uploads/1/3/0/8/130814252/5791089.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421471/normal_5fd7affd5559c.pdfIn PDF document text
    • https://site-1253236.mozfiles.com/files/1253236/bewuxaguvefiv.pdfIn PDF document text
    • https://wanezetisozol.weebly.com/uploads/1/3/4/4/134468493/budata.pdfIn PDF document text
    • https://jirafaribov.weebly.com/uploads/1/3/4/5/134599686/katewupab.pdfIn PDF document text
    • https://fevuxutub.weebly.com/uploads/1/3/4/1/134131759/gazasixawiso-figakotasulosi-fitev.pdfIn PDF document text
    • https://xisiwazebisa.weebly.com/uploads/1/3/4/7/134758569/4111619.pdfIn PDF document text
    • https://wiwawuvagowe.weebly.com/uploads/1/3/4/4/134496439/b88e8741.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476152/normal_5fc1234e0df28.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418972/normal_5fdedf9243bf7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369508/normal_5fb7679793456.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420930/normal_5ffb848f78dd4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xugigabitulu/feluvevawitisemabuma.pdfIn PDF document text
    • https://s3.amazonaws.com/jikopot/insert_excel_sheet_link_into_powerpoint.pdfIn PDF document text
    • https://s3.amazonaws.com/bofake/lejuromufelapu.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_off0000e81f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE81F 5400 bytes
SHA-256: c76794bc37d2a4194943b7ba8ca1e63abfce55af61e4c101e19f029612b8980c
font_01_sfnt_off0000fa6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6F 10144 bytes
SHA-256: 684ceb500434d0daec4078be0ecc88cde70547ea3ba70b9fd8cadfca046edc79