Malicious PDF — malware analysis report

Static analysis result for SHA-256 d77feba22c316983…

MALICIOUS

PDF

67.4 KB Created: 2020-12-19 04:07:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 24ffa165440f68fd19d037197440c68e SHA-1: 8d82de0511ef74e66b0dbcedb52d39a854649f06 SHA-256: d77feba22c31698363561862d7e3bfd56482f87f3243987b42d4c8a7fccaf72f
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, indicating a link farm or phishing operation. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure designed to redirect users to malicious sites.

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
  • 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://trafffe.ru/strik?utm_term=yorehab+yoworld+price+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369648/normal_5fd1960648307.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409394/normal_5fcafb35275b1.pdfIn PDF document text
    • https://menolalosixoj.weebly.com/uploads/1/3/4/7/134714047/wibuzuxonowezunevi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408719/normal_5fc8b7f9ec5f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380083/normal_5f9796ac150c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366980/normal_5f88eff7290d0.pdfIn PDF document text
    • https://wopufibirebosaw.weebly.com/uploads/1/3/4/4/134466277/jupub-puzamemanuni-wavat.pdfIn PDF document text
    • https://pufoviram.weebly.com/uploads/1/3/4/5/134580195/1106a5da.pdfIn PDF document text
    • https://lebotisoko.weebly.com/uploads/1/3/4/5/134597635/6255461.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366360/normal_5f9f29d48656d.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/nefomojuwet/xukawukopetafaja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64414f3b-0edf-4c18-a31a-d8d86c000a46/gowaramumum.pdfIn PDF document text
    • https://s3.amazonaws.com/baritexovopa/marvel_cinematic_universe_quiz_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ffa0f1f-9bd9-479b-989c-217ff61d3e1b/wejobirixovavavo.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_off0000cbb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBB1 5452 bytes
SHA-256: 4030e82ed467699609ca0d8fe6170abe95c47930679f18251d4da41ae1e57e3d
font_01_sfnt_off0000de4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4B 10144 bytes
SHA-256: 7e97f350d663fe7f5b76204ecf1eada020a32927f895e8cc422cdb4ea32ca117

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