Malicious PDF — malware analysis report

Static analysis result for SHA-256 f77f77aa6ad91cbe…

MALICIOUS

PDF

70.4 KB Created: 2020-12-25 05:39:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: dbe978f329c0a753d880326d42e448e4 SHA-1: 9c727c6d4d0e164e01e03b55b30c3e29fb515f73 SHA-256: f77f77aa6ad91cbefdd2ff8e5329826c41e1c01a90e1a740a1560b749e9f1b52
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including ClamAV and an ML classifier. It contains a large number of external links, suggesting a link farm or phishing attempt. While no scripts were explicitly extracted, the PDF structure and the presence of external links indicate a potential for malicious redirection or content delivery, possibly leveraging embedded JavaScript.

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://trafftec.ru/aws?utm_term=big+blue+bus+8+pdf PDF link annotation
    • https://cdn.sqhk.co/toralapiluw/fpcIjaZ/sonic_boom_wellness_carlsbad.pdfIn PDF document text
    • https://zuzefeza.weebly.com/uploads/1/3/1/3/131397950/6623220.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449185/normal_5fce707f1851c.pdfIn PDF document text
    • https://cdn.sqhk.co/xuvomuvugu/LibXgep/santorini_art_gallery.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422148/normal_5fdde8b3ba353.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414491/normal_5f945f5e1b32c.pdfIn PDF document text
    • https://cdn.sqhk.co/muxigatatini/cjbk6jb/tic-_tac-_toe_family_christmas.pdfIn PDF document text
    • https://cdn.sqhk.co/mewidexe/qjiLPji/smurfs_village_magical_meadow_mod_apk.pdfIn PDF document text
    • https://juvikenozenukun.weebly.com/uploads/1/3/4/3/134322787/3064002.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376621/normal_5f9dc5652cfee.pdfIn PDF document text
    • https://cdn.sqhk.co/gemadaruvow/Hllgjhh/tikixabigul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422386/normal_5fb58ac02988a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382779/normal_5fc40c21a48fd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD651 5288 bytes
SHA-256: 23471892542245fda478b23c972a6c0fb5cce9676d802743595cf5aed0e27efb
font_01_sfnt_off0000e865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE865 10752 bytes
SHA-256: 1f89921e6b3327e80d8bb53b21dbef702abdceaeeed44eb47f6d0b7cafcc6e53

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