Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca17f6e07aa7fa51…

MALICIOUS

PDF

71.8 KB Created: 2020-11-11 01:49:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: fc665296362c14d06961393562fe6a5a SHA-1: bee24c0ef6773025b7eefb50f07e9991c462ccf5 SHA-256: ca17f6e07aa7fa51f5b80ebf2772a1616408f74e35f1aab6929cbf96b91ee534
156 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 external links, many of which are hosted on strikinglycdn.com and other similar platforms, suggesting a link farm or SEO manipulation tactic. One of the external links, 'https://traffnew.ru/123?keyword=batch+file+games+color', is flagged as unknown reputation and is likely malicious. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

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
  • 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://traffnew.ru/123?keyword=batch+file+games+color PDF link annotation
    • https://kunobile.weebly.com/uploads/1/3/4/5/134517695/gokopexig_kamewiwiperuz.pdfIn PDF document text
    • https://sozivutapadonen.weebly.com/uploads/1/3/1/1/131164462/f6ffa7e1a9c6.pdfIn PDF document text
    • https://mubewawabover.weebly.com/uploads/1/3/4/4/134465459/senivaxifop-gemud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366007/normal_5f986b5580a36.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/ed99ab86-9b76-4f8f-b4fb-350173d51f94/17944879475.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68481cda-7e25-4f07-93d2-12ca2cc9056c/51346726155.pdfIn PDF document text
    • https://s3.amazonaws.com/babetafaperaxov/pentek_intellidrive_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a5017b9-6f52-418a-99e4-179cb4273929/mitujotidopapovukexa.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzed/44747871971.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b079417-5d18-4e62-b363-e3a6b29883d5/brine_shrimp_lab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02cd7750-0c89-4ecd-bf68-bbadf2b48930/xutogejo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ea31821-249e-4d8e-9320-4c474478a4cc/89611756415.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba8f1c8b-6837-46a4-b7d7-515d7366fadd/logoko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ecb619f-1098-42fc-b1de-2d72b6548228/sodizud.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_off0000d5fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5FC 5344 bytes
SHA-256: 78392db22eb381f1c3531315079ee679e1a546e154b6dfc6ad0d530a759d0d4f
font_01_sfnt_off0000e800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE800 12456 bytes
SHA-256: 844a3cde2e0585edf54b548e16dcf4125ea8fbab45f90839d5cd93b5ba4e87bc

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