Malicious PDF — malware analysis report

Static analysis result for SHA-256 255b740c420d29d7…

MALICIOUS

PDF

71.2 KB Created: 2020-12-29 16:53:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: fb6020e46a3ffae4dbbc04f5c0ce8063 SHA-1: ce94976493b497da2ee412e22bb494863306241e SHA-256: 255b740c420d29d73915836bd2480aab97fc3f4eca6b96b106b56fd1b81522fa
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan. The document body, though heavily obfuscated, contains text that appears to be a lure for users to click on these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cctraff.ru/123?utm_term=caravan+canopy+sports+evoshade In PDF document text
    • https://cdn.sqhk.co/perigupa/whbnUib/airport_controller_game.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421472/normal_5f9cff1dccc70.pdfIn PDF document text
    • https://powumebaporisav.weebly.com/uploads/1/3/4/8/134891471/busalefenole.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://s3.amazonaws.com/nademopor/83038109850.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a6db5f8-3b64-4bd3-9766-f81f5cdfc70a/3057829566.pdfIn PDF document text
    • https://s3.amazonaws.com/zetituri/bear_river_reservoir_yelp.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e16904c5-172e-44ba-b88f-117431362aed/tafonikokovop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce3a3c65-7b46-4e71-aade-defb44332b7d/basuwatotuze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f9fdfc1-4ae0-4276-a1c6-effe00e045b8/animal_adaptations_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/solonebosop/business_development_executive_roles_and_responsibilities.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_off0000cbd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD1 5056 bytes
SHA-256: 33b4bb7785858eb9a2ad89804180ff08cd5d853393356e2410ca5f3832395931
font_01_sfnt_off0000dcff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFF 10924 bytes
SHA-256: ce04f412f4787494e713ddf7ea90715d65c5d52b9de9b15d23993894826f4d12
font_02_sfnt_off0001025d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1025D 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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