Malicious PDF — malware analysis report

Static analysis result for SHA-256 a670478a6f525275…

MALICIOUS

PDF

67.9 KB Created: 2021-04-15 20:55:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ca2f9adab434ae518c7f7dbcc586a252 SHA-1: ced2ab8d9e30b0d4a57765126b46152de315f5e2 SHA-256: a670478a6f52527553822423c121af87912a2e30db251dce82fdb20894f67438
126 Risk Score

Malware Insights

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

The PDF document is identified as malicious by ML classifiers and ClamAV, and contains numerous embedded URLs. One prominent URL, 'https://ponafet.ru/strik?utm_term=craftsman+100+radial+arm+saw+manual', suggests a phishing or scam attempt disguised as a manual. The PDF's structure and the presence of multiple disposable hosting links indicate a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://ponafet.ru/strik?utm_term=craftsman+100+radial+arm+saw+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4426270/normal_600c6ed3d8fd0.pdfIn PDF document text
    • http://bagedejatobino.22web.org/7451928287.pdfIn PDF document text
    • https://dipalowijoje.weebly.com/uploads/1/3/0/9/130969855/e50926.pdfIn PDF document text
    • https://makigomeludawuk.weebly.com/uploads/1/3/4/7/134748455/8851583.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411270/normal_5ff8b826cd823.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414161/normal_60341b3ebda66.pdfIn PDF document text
    • https://kaperimivegorew.weebly.com/uploads/1/3/4/3/134371305/xujaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4529087/normal_606299d58835e.pdfIn PDF document text
    • https://fenikazegalo.weebly.com/uploads/1/3/1/3/131379965/gegategolatur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419191/normal_603a1022ef9ae.pdfIn PDF document text
    • https://vigoxanumevu.weebly.com/uploads/1/3/4/4/134466257/gawaxixusapiwukifi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sawuliwinupunud.epizy.com/95622729135.pdfIn PDF document text
    • https://s3.amazonaws.com/biwubeleba/89432315569.pdfIn PDF document text
    • https://s3.amazonaws.com/jokotaziweluge/5435566995.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2aedcda-ed1f-4e28-a4d9-b56ce0409883/77906805893.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfdfd3cd-17b7-42c3-9eca-f1321334e82a/streetcar_named_desire_movie_vs_play_ending.pdfIn PDF document text
    • http://pujezatujunovi.epizy.com/abigail_williams_character_chart_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxawetawupo/wudogoxa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/510b0080-2ff9-48f5-96f5-ad2f31442721/nipamadelipasabaluwew.pdfIn PDF document text
    • http://dulefuzobov.rf.gd/bfdi_official_character_guide.pdfIn PDF document text
    • http://tesuluxabel.rf.gd/converting_measurements_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61d5a3b6-0651-403c-bf12-be8d0f130222/which_is_better_inkjet_or_laser.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_off0000ccd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD7 5244 bytes
SHA-256: 21ce90073907d82161b522fdf1ef03864854b42fdc06ed0a1a8aa8c6251c5916
font_01_sfnt_off0000dea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA8 10408 bytes
SHA-256: 651e80e24c3dac89c00e5395f75bcdc58ddd673ae2780f27f30ad938ec0240ca