Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6f43d039d15d287…

MALICIOUS

PDF

67.4 KB Created: 2020-11-24 07:34:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 8b916815a65f9fbc520cb970eb313270 SHA-1: 3e02a9197b9e6e6a035a57b274b35ac2d24213e5 SHA-256: e6f43d039d15d2879e61f770d21ccb6e9a7905865bfa9b7bed252236a6fe43f6
186 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical PDF_SEO_LINK_FARM rule and ML_NYX_PDF_MALICIOUS, indicating a high likelihood of malicious intent. The embedded URLs and the structure of the document suggest it's designed to redirect users to potentially harmful external sites, possibly for phishing or malware distribution. No scripts were extracted, but the PDF structure itself is indicative of a link farm attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffe.ru/aws?utm_term=most+ed+android+games+2019 PDF link annotation
    • https://fonomirul.weebly.com/uploads/1/3/4/3/134336784/kasasutorakemoju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374857/normal_5f8a18230ec7f.pdfIn PDF document text
    • https://wavutokemik.weebly.com/uploads/1/3/4/3/134309613/sodepaxa_zirikixawuwo_gimar_firadisov.pdfIn PDF document text
    • https://bubixoduxufito.weebly.com/uploads/1/3/1/0/131070588/8b3e0a.pdfIn PDF document text
    • https://gofasajuv.weebly.com/uploads/1/3/4/3/134359632/pajejelosapasoxomev.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/36ce75ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366958/normal_5fa4351e1512a.pdfIn PDF document text
    • https://suganolorifumu.weebly.com/uploads/1/3/0/8/130814011/ae1a7.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/bf5422a4-6fbd-4684-a7ef-680c6ab4f068/75924583144.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75f3f699-e748-4e62-9d2d-fe60c72198d2/amplifier_speaker_matching_calculator.pdfIn PDF document text
    • https://s3.amazonaws.com/kavalukato/agile_project_management_templates.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31e9dd10-74b0-4b29-ba02-a5c6cfb12294/download_video_minecraft_song_i_am_believing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/030efc5b-278d-4469-a3d5-ff08a7fd8f97/43632414230.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_off0000cbd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD8 5600 bytes
SHA-256: f311eb51e0924af9d4c34eb06e9d5ecd61fd94bd77d315a01ba4ff24e4a90cf7
font_01_sfnt_off0000dedc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDC 10012 bytes
SHA-256: fed33412879998c8dfed073dce39877349854d18f0538e9a55a7166ce22f0ff0

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