Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc702f6673743d2f…

MALICIOUS

PDF

69.7 KB Created: 2020-12-21 22:43:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: ca0e4711b10e5029828890b4d75bbce7 SHA-1: a1feb826a53bff9254e8a04e3eab43d7f390721f SHA-256: bc702f6673743d2f18451864336e2612f9045b09ac697f8d01a10d1f5bf80fb5
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting services, suggesting a link farm or phishing operation. The embedded content, though heavily obfuscated, is associated with a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The ML classifier also flagged this PDF with high confidence. The primary attack pattern involves directing users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafficel.ru/aws?utm_term=removing+gridlines+from+excel+sheet PDF link annotation
    • https://dusexitope.weebly.com/uploads/1/3/4/6/134646398/960b96b0e.pdfIn PDF document text
    • https://dabatipiregu.weebly.com/uploads/1/3/4/4/134435287/fab82c648.pdfIn PDF document text
    • https://wetewiduwolenit.weebly.com/uploads/1/3/4/5/134599830/powigiriz.pdfIn PDF document text
    • https://nulixedupalaz.weebly.com/uploads/1/3/0/7/130739510/1715380.pdfIn PDF document text
    • https://jumegelizo.weebly.com/uploads/1/3/4/7/134712838/paxakafimobug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391925/normal_5fbcce4fc2b91.pdfIn PDF document text
    • https://jupovibofekek.weebly.com/uploads/1/3/4/4/134490290/vesetojujo_gowira.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445879/normal_5fad9099be028.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/95b155fa-c255-43d4-8d64-6b2d6a5adb1b/35813431750.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbc0b7fc-c256-409a-ae11-41b8850890fe/d_gray_man_manga_187.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4b4e75a-0fcc-47c6-8940-e90259283cb5/joxigavabolokam.pdfIn PDF document text
    • https://s3.amazonaws.com/jexijer/24936257845.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04839771-e0c9-416e-a027-371a1e0f78e6/46578012875.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_off0000d1ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1AC 5360 bytes
SHA-256: f6970fb819a56d9ea4d452a34c350d7fae3890bb86573ed3982ca59d630f4c09
font_01_sfnt_off0000e3d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D2 11140 bytes
SHA-256: 41be49fa8d91a8515736bab3a4bc95c17f21402b361462f675831e3f65cf5559

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