Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8d3bcaea67f4c9e…

MALICIOUS

PDF

84.6 KB Created: 2020-12-03 19:00:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f6ee79cf5eeaf6640c159cf989bb0e31 SHA-1: 1c79d21d09c894f986994539de42d38f83cb8bae SHA-256: a8d3bcaea67f4c9e62c0a3c45049104eedddd02c9847ea2b5e45c8a5410eb026
164 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used in link farm attacks or to redirect users to malicious websites. The presence of a 'Download Now' heuristic further suggests a malicious workflow. ClamAV detection and ML classification confirm the malicious nature of the file, indicating it's likely a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 6

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trafffe.ru/aws?utm_term=canon+eos+700d+operating+manual
    • https://tipozuroboga.weebly.com/uploads/1/3/4/2/134265922/dineroretozibaziven.pdf
    • https://cdn-cms.f-static.net/uploads/4365620/normal_5fb8f582d3b78.pdf
    • https://cdn-cms.f-static.net/uploads/4456369/normal_5fae962bd3daa.pdf
    • https://cdn-cms.f-static.net/uploads/4371004/normal_5f97ea3004dc3.pdf
    • https://cdn-cms.f-static.net/uploads/4413007/normal_5fa34d950dddd.pdf
    • https://cdn-cms.f-static.net/uploads/4368736/normal_5f88068a5aaf5.pdf
    • https://pigogokeda.weebly.com/uploads/1/3/1/8/131857695/1012d5f1d52e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fc504c07848ba205d332f1e/t/5fc7076eb7521d608a3bf9df/1606879095923/dapiwagejepedekazu.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd18c47ad7de4c64a58a4b/1606228165230/vadakerazaj.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfcf.bin
c3535dd41476eebf6ac32815e39482f32909ce4a3dab0c33feaa9cf7a3447b7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCF 2968 bytes
font_01_sfnt_off0000ea64.bin
7c74d5f22942b781792783ee3ea6c60ec7dea11e3c00e6876a4f5fb71dd3cfd0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA64 5404 bytes
font_02_sfnt_off0000fcae.bin
e3f84ab1e41ca264b8186b036be71d902cfdceaddef88863235071addf4279cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAE 16928 bytes
font_03_sfnt_off00012f8d.bin
9c4efd5b3675762e9931b0b7801f72eeb5813b156036f90ac024f4c8a95e3250		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F8D 16284 bytes

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