Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bba905a3a7e26d4…

MALICIOUS

PDF

80.4 KB Created: 2021-05-20 13:05:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 2bbf2804f109e779f3c264610e3700d0 SHA-1: f0972e1ca20f1d35bfacc3b536f6768ad76d2912 SHA-256: 5bba905a3a7e26d4a8c12adc4ecdaffcbfd3d7bd9b57ef4f3031a65c1251132f
244 Risk Score

Malware Insights

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

This PDF document functions as a link farm, containing numerous embedded URLs designed to redirect users to external sites. The presence of a link to a known malicious redirector and the overall structure suggest a phishing or malware distribution attempt. While no scripts were directly extracted, the PDF's nature and the heuristic firings strongly indicate malicious intent, likely to lure users into clicking on malicious links.

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://dafemum.ru/strik?utm_term=legend+of+the+boneknapper+dragon+full+movie+in+hindi In PDF document text
    • https://bigonokefexix.weebly.com/uploads/1/3/4/5/134518339/xalono.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479917/normal_601dc0cdd4647.pdfIn PDF document text
    • https://kavasudominid.weebly.com/uploads/1/3/0/8/130813783/72fe66b389f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417815/normal_605cb09896317.pdfIn PDF document text
    • https://nexirexosevexos.weebly.com/uploads/1/3/4/5/134500935/6632431.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484609/normal_604a79600967b.pdfIn PDF document text
    • https://bojemesazam.weebly.com/uploads/1/3/4/5/134598919/difomuvakiguf_gopubatid_vasibupagoxole_numuvopapusi.pdfIn PDF document text
    • https://kufesivewafe.weebly.com/uploads/1/3/1/3/131384244/kawumepibujam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427820/normal_602613d4659a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471234/normal_60120a7c06e44.pdfIn PDF document text
    • https://vomalokigalexa.weebly.com/uploads/1/3/4/3/134329787/judogupif_likelew.pdfIn PDF document text
    • https://pebezudaxefen.weebly.com/uploads/1/3/4/3/134347708/6540696.pdfIn PDF document text
    • https://donedupefunesu.weebly.com/uploads/1/3/1/6/131607777/fcc0f01af736a.pdfIn PDF document text
    • https://nawawedivoxoni.weebly.com/uploads/1/3/4/7/134719505/xozex.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401972/normal_5ff40c9dd90a1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469135/normal_60058257c8d4d.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/d900386a-3721-4009-8a37-0c5751527a78/kesuzazaxusasusabop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d69a4331-7fca-4172-ab4c-0f1ed8ab68f8/lujexubufulofo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bc105da-a38a-4aff-8813-e5900ac1e771/kigabalowumeten.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/833c6ebd-b7be-4fb0-b3cf-89805c85104f/32397542880.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_off0000fe76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE76 5484 bytes
SHA-256: 0859eded346ca798931594242b5fdad94d276f3698da3d223d2f82a4fa5d2235
font_01_sfnt_off00011101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11101 10272 bytes
SHA-256: 3f228af3ca54ba0e5b50f5313542aeb427bc43d24619899828d94fb3fe666aec