Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d2f00d21398c63b…

MALICIOUS

PDF

74.9 KB Created: 2021-01-12 11:29:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 2f14c0b2fbca30bee3caa314d91d7855 SHA-1: 870a5ac180b219617bb162461f64ee4086965d1a SHA-256: 5d2f00d21398c63b5b6df069af1ca1af95777ebf2582d103d8c21fabc187812e
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it functions as a link farm, directing users to multiple disposable domains, with one notable URL being https://trafffi.ru/aws?utm_term=nintendo+3ds+games+free++cia. While no scripts were extracted, the presence of numerous external URIs and the link farm characteristic strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://trafffi.ru/aws?utm_term=nintendo+3ds+games+free++cia PDF link annotation
    • https://site-1168102.mozfiles.com/files/1168102/pusedubazijojibanoderaj.pdfIn PDF document text
    • https://babinekisifuve.weebly.com/uploads/1/3/2/6/132696104/477c0266e6c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487186/normal_5fee6649c4ef8.pdfIn PDF document text
    • https://mijevofere.weebly.com/uploads/1/3/1/6/131606011/6352001.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4506159/normal_5fdc50a995e17.pdfIn PDF document text
    • https://site-1175983.mozfiles.com/files/1175983/download_hd_camera_for_laptop_windows_7.pdfIn PDF document text
    • https://site-1177041.mozfiles.com/files/1177041/fgteev_soundboard_ios.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379964/normal_5f8ff19d7e7b2.pdfIn PDF document text
    • https://site-1176776.mozfiles.com/files/1176776/46470226524.pdfIn PDF document text
    • https://nubawobadeg.weebly.com/uploads/1/3/4/1/134131997/temaxesogoneraxujoz.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/wunojipu/sebizajigekajefefexunij.pdfIn PDF document text
    • https://s3.amazonaws.com/gedesisumi/tree_diagram_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/liluvad/xojidizalarifafulu.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_off0000e571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE571 5440 bytes
SHA-256: e941155187949dfd34889e129f0e4ad4c8562198cbfc0e40371c25d9de708be0
font_01_sfnt_off0000f7e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E4 10960 bytes
SHA-256: 3c3e480ea961588dbf01157d40545512fc7d3844dcd2116cc9173dfa2d262584

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