Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d617abf816db938…

MALICIOUS

PDF

71.9 KB Created: 2021-02-20 05:08:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 6b0c1534c067b19d5a88193527f30cc1 SHA-1: 19b6eaaaa4dcd8583509410d0db0560c99f2992e SHA-256: 6d617abf816db93826d844be296a88cf70ed312eb1dee5a8a8f739b657d1d11e
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains a large number of external links, many of which point to PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The document body, though heavily obfuscated, contains text related to a humidifier manual, likely a lure to encourage users to click the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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://jacksth.ru/aws?utm_term=vicks+cool+mist+humidifier+v3100+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4490125/normal_601979ad1cbcd.pdfIn PDF document text
    • https://cdn.sqhk.co/sikibeve/hfichib/87776496341.pdfIn PDF document text
    • https://zunexoxefa.weebly.com/uploads/1/3/5/3/135340588/devagudijavimafabo.pdfIn PDF document text
    • https://cdn.sqhk.co/savunowudob/jhcfdjg/44594769383.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418188/normal_5ff275ecaf30f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388173/normal_602611ea486ac.pdfIn PDF document text
    • https://cdn.sqhk.co/sizafutito/TificoP/derozofowap.pdfIn PDF document text
    • https://tegedibinatamam.weebly.com/uploads/1/3/5/3/135350324/jimajegexawi-wufelubu-silatetoxez.pdfIn PDF document text
    • https://cdn.sqhk.co/fukonovum/N6Ugihe/79131771614.pdfIn PDF document text
    • https://sisilodoja.weebly.com/uploads/1/3/1/4/131406442/47438.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379385/normal_5fde9eefde021.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483839/normal_602876d4b8c79.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
    • 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_off0000c4e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4E1 5588 bytes
SHA-256: 9f8aa73fde0ee524f112bfb248d9bda576c4b6f923ea5689ecdf67335243822e
font_01_sfnt_off0000d7c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C4 13508 bytes
SHA-256: b7cf79386ead7247fa74a09879595e59c1a14e02da371bef441439ac78c102e1
font_02_sfnt_off0001025e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1025E 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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