Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7f73ee394d4190b…

MALICIOUS

PDF

74.0 KB Created: 2020-12-20 04:35:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: abcfc1dc8a2bf71592e62923672406d0 SHA-1: 9881f6ab7164cb5971f082365404f168b6bf1135 SHA-256: d7f73ee394d4190bae47a1c9eb07d5968125ac3d5e2960f84cba6438bb430618
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple critical heuristics for containing malicious redirector links and a large link farm. The ML classifier also strongly indicated maliciousness. The document appears to be part of a spam or phishing campaign designed to direct users to potentially harmful websites.

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
  • 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://gettraff.ru/strik?utm_term=sustaining+spells+shadowrun+5e In PDF document text
    • https://cdn-cms.f-static.net/uploads/4414849/normal_5f9fd8627aa3c.pdfIn PDF document text
    • https://sinevojixataxer.weebly.com/uploads/1/3/4/1/134131740/8098929.pdfIn PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/1d1f8ecc085ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383146/normal_5f9415fb81974.pdfIn PDF document text
    • https://zevebijupaxize.weebly.com/uploads/1/3/4/7/134754497/vorisi.pdfIn PDF document text
    • https://befakudi.weebly.com/uploads/1/3/4/5/134595811/dimiba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369763/normal_5fb8bd79d2da4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413012/normal_5fa4a690edd71.pdfIn PDF document text
    • https://suvuleje.weebly.com/uploads/1/3/4/8/134871599/8368548.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500670/normal_5fae4edb2962b.pdfIn PDF document text
    • https://virenogapugutu.weebly.com/uploads/1/3/4/6/134635416/7378226.pdfIn PDF document text
    • https://bejasesazopo.weebly.com/uploads/1/3/4/5/134512805/6936122.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/26aaaded-dae9-427e-bb47-012c16643267/94872271910.pdfIn PDF document text
    • https://s3.amazonaws.com/votawawo/casio_protrek_manual_2894.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaporam/mixed_fraction_to_percent_worksheet.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_off0000e352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE352 5540 bytes
SHA-256: 74611210deb79f889399ed028a7611a5416abebcdf961ff7f5c21f3304385b09
font_01_sfnt_off0000f634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF634 10928 bytes
SHA-256: b9dbe381c6f8852507a1593416d14c2acef0add98d3fc48feb61440b5d584b8e

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