Malicious PDF — malware analysis report

Static analysis result for SHA-256 631241ce092aada4…

MALICIOUS

PDF

80.1 KB Created: 2020-12-17 21:15:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 5dccca0183428a71f2d078989f8d093a SHA-1: ee8f0af0a9e9b70c60d98e7cdeb8910e599dae9a SHA-256: 631241ce092aada4b4593102e09bbb3a26185a7f10db78fc6248db24fcf94de1
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded links likely serve to direct users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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=dark+souls+2+hex+build+pve In PDF document text
    • https://cdn-cms.f-static.net/uploads/4380068/normal_5f9292121e75b.pdfIn PDF document text
    • https://kerawidirara.weebly.com/uploads/1/3/4/7/134746453/nisel-javukufivaruweg-kifoxut-dejiwerot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370268/normal_5f8b954417b26.pdfIn PDF document text
    • https://winomumamo.weebly.com/uploads/1/3/1/0/131070375/6019285.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443617/normal_5f9c4864d138a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366408/normal_5fae06a8f3165.pdfIn PDF document text
    • https://bapoxaluw.weebly.com/uploads/1/3/4/7/134717037/9045416.pdfIn PDF document text
    • https://bakavola.weebly.com/uploads/1/3/4/7/134753875/64318a68584d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389801/normal_5f9c3d90628c2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/c8473122-3f9c-4038-ba99-8996547d974f/33784035555.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf5eb4e18c5c478ef38f62/1606377140857/19645399830.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e980cadc-771a-42ae-a352-54a04fb36559/fleck_5600_water_softener_service_manual.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc651a66b97992eb58066be/t/5fc6a621e18c5c478ee5d170/1606854178262/earth_wind_and_fire_devotion_meaning.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEF 5204 bytes
SHA-256: dfd24a6ec64394b22bae0ec60ee7eac6d5dc4d119ec2a7ca9475d492de413d11
font_01_sfnt_off0000feb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB9 11680 bytes
SHA-256: fb74dd3ba31a7fbd005994cf3db6f0e5f3744de7ec45021abdc356b19681a837
font_02_sfnt_off000125da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125DA 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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