Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d317aa77fd9e217…

MALICIOUS

PDF

75.5 KB Created: 2021-05-27 04:09:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 0a58d9c0a60a64f599906b37b57100a9 SHA-1: ecc75032304fd5443f16b2f7b81ad3bfa5ac33e7 SHA-256: 9d317aa77fd9e2177417dfa07299a6610762087c0b2c3924a1ce7d31b5bfb918
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification strongly suggests malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://mezovuduw.ru/strik?utm_term=t%25C3%25A9cnicas+b%25C3%25A1sicas+de+enfermer%25C3%25ADa+macmillan+solucionario PDF link annotation
    • https://tazifidaron.weebly.com/uploads/1/3/4/9/134901468/rofabize_fowopov_xukofuve_luwunewoku.pdfIn PDF document text
    • https://fikelepokaretes.weebly.com/uploads/1/3/1/3/131397971/7100647.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419452/normal_600f75dc4b7e6.pdfIn PDF document text
    • https://sumikoxivabozo.weebly.com/uploads/1/3/3/9/133997645/1c7264bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415739/normal_6016c29e6c2e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451206/normal_603f469266977.pdfIn PDF document text
    • https://boxijobanopuvob.weebly.com/uploads/1/3/0/7/130739783/setugumigibetutefej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462974/normal_602302234e356.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380530/normal_603aeb1972446.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408170/normal_5feb50b970134.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483589/normal_60160d01f0d24.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422637/normal_5ffab40688122.pdfIn PDF document text
    • https://nizikalod.weebly.com/uploads/1/3/4/6/134605229/2934.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380088/normal_5ffc30691c332.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420939/normal_60357df678dc0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383679/normal_606b074096e07.pdfIn PDF document text
    • https://milanabez.weebly.com/uploads/1/3/2/6/132695465/reziribuvaxe-nevetegiwi-zujigot-towow.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475872/normal_5fcb7baf59396.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449766/normal_5fcf2f33a3824.pdfIn PDF document text
    • https://venireza.weebly.com/uploads/1/3/5/9/135959939/dujomimexagu.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/0914ea6c-2ff4-42d8-9aa2-ca163b946cff/release_your_brakes_james_newman_audiobook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf3215ce-2a0b-4151-a4f1-bf6133227a60/juzuku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fc7f3cd-91e6-411e-94e0-957ee6024a2b/wugibuvuxilupofuwi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b77a35d6-8e69-4dda-90de-396914120e54/online_excel_spreadsheet_course.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_off0000e517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE517 5688 bytes
SHA-256: 7ddda9f09877788e84e73eb395d96657532b893521288b98154764bed2975e07
font_01_sfnt_off0000f774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF774 11920 bytes
SHA-256: ad3384abafb1997ea24916c8b9d3058cf64659e9d474eeb318a8a7400d650822