Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f88f4871fec52f5…

MALICIOUS

PDF

72.0 KB Created: 2021-01-12 11:06:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: b21e4472862f550002b5a4e9c007a6b7 SHA-1: 76ccb26563f0b27aac55a42be0e1aa6ca48c1934 SHA-256: 7f88f4871fec52f51ae0310712462b776d8e414b941021a93456467527da482f
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links pointing to external PDF files hosted on disposable domains, a common tactic for SEO manipulation or distributing malware. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier and ClamAV also flagged this PDF as malicious, indicating a high likelihood of malicious intent.

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
  • 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://cctraff.ru/123?utm_term=chapman+high+school+football In PDF document text
    • https://cdn.sqhk.co/momujolo/D9jggjk/bibomidenizobudulufokabok.pdfIn PDF document text
    • https://talipugetajizan.weebly.com/uploads/1/3/4/8/134862074/6c1051e728835f2.pdfIn PDF document text
    • https://fijakesu.weebly.com/uploads/1/3/4/5/134527503/liperit_rulerar_vezedaxenin_ripedituronomu.pdfIn PDF document text
    • https://bazunebusa.weebly.com/uploads/1/3/5/3/135397504/dusate.pdfIn PDF document text
    • https://xubikorapaja.weebly.com/uploads/1/3/4/3/134335605/5fd221417a.pdfIn PDF document text
    • https://papunagaku.weebly.com/uploads/1/3/1/3/131384156/728af481.pdfIn PDF document text
    • https://bilewazivabo.weebly.com/uploads/1/3/2/8/132816117/1886305.pdfIn PDF document text
    • https://lanujedajifita.weebly.com/uploads/1/3/1/3/131382078/9369168.pdfIn PDF document text
    • https://xipuruvu.weebly.com/uploads/1/3/4/6/134654852/2119017.pdfIn PDF document text
    • https://papunagaku.weebly.com/uploads/1/3/1/3/131384156/d1eb6e57648.pdfIn PDF document text
    • https://site-1177005.mozfiles.com/files/1177005/crossing_jordan_season_3_episode_7_cast.pdfIn PDF document text
    • https://zuduberojep.weebly.com/uploads/1/3/1/3/131398404/c400457f31b5.pdfIn PDF document text
    • https://balikawe.weebly.com/uploads/1/3/4/6/134659528/dibivif.pdfIn PDF document text
    • https://xalemewo.weebly.com/uploads/1/3/4/6/134665704/vavobogugifat.pdfIn PDF document text
    • https://site-1168324.mozfiles.com/files/1168324/tozevozeloxujivupuwo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410954/normal_5f95b56e12ec0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000dc1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1A 5376 bytes
SHA-256: bced8c00ff3de32cf3ed5b754df37d567c7b2a9f0cb1e9b42ed501c2fe7091a3
font_01_sfnt_off0000ee45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE45 10744 bytes
SHA-256: 8916d1fa3c834f966c8be0ee3b3c0ef31ab38fa51c192a9dabfba2aedcc76977

Open this report in the interactive analyzer, or submit your own file for analysis.