Malicious PDF — malware analysis report

Static analysis result for SHA-256 6351e85c4ec6c604…

MALICIOUS

PDF

65.9 KB Created: 2020-11-13 20:56:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: d270570c34d3c0390fcb302544c889a6 SHA-1: db269e2fd5a8421ca90538223c8dbbb7b24bb878 SHA-256: 6351e85c4ec6c604cd8d178b9ed01cd416fef8a3d918967aaf2867218901d98a
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and a machine learning classifier. It contains a significant number of embedded links, many pointing to disposable hosting and redirector infrastructure, suggesting a link farm or phishing attempt. The primary malicious link identified is https://gettraff.ru/strik?utm_term=winchester+model+370+16+gauge+value.

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://gettraff.ru/strik?utm_term=winchester+model+370+16+gauge+value In PDF document text
    • https://xebivonejawaf.weebly.com/uploads/1/3/4/0/134096192/pukax-gabidixadosezak-pitulalegokazud-xapikolenu.pdfIn PDF document text
    • https://rapexinet.weebly.com/uploads/1/3/4/3/134328854/labuloramav-jezokanukox.pdfIn PDF document text
    • https://lefedatit.weebly.com/uploads/1/3/0/7/130776734/4616454.pdfIn PDF document text
    • https://futokiwusilo.weebly.com/uploads/1/3/4/4/134458686/2451088.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384647/normal_5f944f081c0b5.pdfIn PDF document text
    • https://keziripar.weebly.com/uploads/1/3/4/5/134522929/ligirojomareg.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/liguwubore/89011041522.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51f2bcc2-1a7c-4755-9dca-fe66750f4574/sunixenijebirejexedamono.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7c45448-81c9-4d8d-b3d8-98643c8667ff/40816249411.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc30c2ef-00a9-448d-826f-c8ded2897def/fobinupateronudapulo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c43708c-00a0-42d2-b934-9156f1880437/2183937898.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b34208ce-8595-42fc-9ef4-65a33cc22d6f/4483223727.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63c16646-6dbf-4d95-be05-e1d0bb17ffaa/belvedere_elementary_school_staff.pdfIn PDF document text
    • https://s3.amazonaws.com/mufukep/bonewu.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_off0000c21a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC21A 6016 bytes
SHA-256: c2095069c5bf4330e1ec6786ce6ad60d43f302fb01b046c8e067b40ca20e262c
font_01_sfnt_off0000d684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD684 10564 bytes
SHA-256: 3fb4edfab7c56bb1a86e6c482c4b085a96da6702830eb0408efa30abbac074db

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