Malicious PDF — malware analysis report

Static analysis result for SHA-256 2eff5a0b5306bb11…

MALICIOUS

PDF

79.4 KB Created: 2020-11-17 21:59:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da6208e24c47a20d2e87a1a441915f73 SHA-1: 498f6d69dc7058241f51156ab3c18ea81100ab5a SHA-256: 2eff5a0b5306bb11bb2b70d0bb97b2b5ad4a1b6e5eef38accd0f347173505bf2
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URI suggest it's designed to exploit users by directing them to potentially harmful URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/strik?utm_term=barron+s+ap+environmental+science+6th+edition
    • https://cdn-cms.f-static.net/uploads/4365552/normal_5f8e0b97c85a0.pdf
    • https://cdn-cms.f-static.net/uploads/4416496/normal_5fa820189e65e.pdf
    • https://cdn-cms.f-static.net/uploads/4388420/normal_5f9a35d85f479.pdf
    • https://cdn-cms.f-static.net/uploads/4448547/normal_5fa223d730a25.pdf
    • https://rofibefis.weebly.com/uploads/1/3/4/1/134131293/togevujipidej-mebapiwipa-latudegi.pdf
    • https://cdn-cms.f-static.net/uploads/4373797/normal_5f8af9bb38019.pdf
    • https://cdn-cms.f-static.net/uploads/4416494/normal_5fac017facd2a.pdf
    • https://pudiwozi.weebly.com/uploads/1/3/4/5/134510484/ligivuganotux.pdf
    • https://cdn-cms.f-static.net/uploads/4374374/normal_5f9b9f569eee6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/midipes/nc3_bookkeeping_exam_reviewer.pdf
    • https://s3.amazonaws.com/robumuduluwise/5416354549.pdf
    • https://s3.amazonaws.com/xozeb/dark_web_search_engine_apk.pdf
    • https://s3.amazonaws.com/gupuso/kivemukinuzuref.pdf
    • https://s3.amazonaws.com/wutezigojuxi/neurologist_career_information.pdf
    • https://s3.amazonaws.com/jumedemimo/zedawebobid.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebb3.bin
c057b4cc21eeea7e47b6f212c05de14a0b53e4105c20dc108d679b7bef8b1c07
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB3 5364 bytes
font_01_sfnt_off0000fdbf.bin
4d529166f87e671a823a63dc4ff20a865d364f9124aaa54c5fac4d97c1b413d9
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBF 11048 bytes
font_02_sfnt_off00012213.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176
pdf-font-stream PDF embedded font (sfnt) at offset 0x12213 4324 bytes