Malicious PDF — malware analysis report

Static analysis result for SHA-256 fba6500dc449dc35…

MALICIOUS

PDF

83.3 KB Created: 2021-05-31 13:03:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: c146523e3c5938194d5c73bc65728ee8 SHA-1: ac08c72a6abc5c9981aa50c2ef1099c2ee6ef1c5 SHA-256: fba6500dc449dc358f6222d004cfd4891e6936f1f0781b539b54eed28b4dd252
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links pointing to various domains, many of which appear to be disposable hosting services. This behavior is characteristic of a link farm designed to distribute malicious content or facilitate phishing attacks. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://lozipotod.ru/123?utm_term=homeready+mi+guidelines PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4374359/normal_5fef0ff887d27.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407747/normal_5fed1a995017b.pdfIn PDF document text
    • https://juwarojolajekol.weebly.com/uploads/1/3/4/1/134108785/6311451.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414332/normal_60507b3e0146d.pdfIn PDF document text
    • https://kiretadipul.weebly.com/uploads/1/3/4/0/134040802/ponolamaluma.pdfIn PDF document text
    • https://jixerunoxeza.weebly.com/uploads/1/3/4/6/134678785/lewofomutupuruvix.pdfIn PDF document text
    • https://sipusojatavajuw.weebly.com/uploads/1/3/4/6/134606658/sakojagawuj.pdfIn PDF document text
    • https://finowizefi.weebly.com/uploads/1/3/1/3/131383614/vujozisesutupeli.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489598/normal_5fc853ef26810.pdfIn PDF document text
    • https://gilukuxuzi.weebly.com/uploads/1/3/4/4/134494221/rabunevakam.pdfIn PDF document text
    • https://lutividagij.weebly.com/uploads/1/3/4/8/134896544/xoxopotewiwetevifure.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4391907/normal_60b40a6ccd99f.pdfIn PDF document text
    • https://xiworibamenu.weebly.com/uploads/1/3/4/7/134728691/1e179500.pdfIn PDF document text
    • https://tovadifu.weebly.com/uploads/1/3/4/0/134096489/7175410.pdfIn PDF document text
    • https://lufufalab.weebly.com/uploads/1/3/4/6/134634403/9933039.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/c9f5c61d-affa-4ff6-92d5-6d4e700a5fc2/is_the_dark_tower_movie_based_on_stephen_king_books.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89e0ea1e-8632-41ba-978a-9aae6786da51/2013_honda_civic_oil_maintenance_reset.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0c263d9-850e-4929-b30e-909914a012fd/jajokudiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89369218-2de0-4b0b-8922-c02bddba3ed8/95570849186.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f26b5994-e444-49f2-8b76-dd288d2101ed/new_hartford_police_blotter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0fe1436-9997-4557-8235-e86bdc382f88/tapifotefobogiziziv.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_off000104aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AA 5208 bytes
SHA-256: 3b28c41fa7865cfbb39c950f8bea8407dbea9525e188cc3a86a2b6c6d4711830
font_01_sfnt_off0001164d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1164D 12204 bytes
SHA-256: f91e80bd8dc054bad3692e1287b5d41590300eb5444754a1f543a7177566665e