Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6070c0eaab1e4a4…

MALICIOUS

PDF

72.1 KB Created: 2020-12-27 21:44:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0ce9aafc9f5c457148a5c9c402ac6842 SHA-1: 0561e0af1f0c9e940d27ca533ae265a961f6264a SHA-256: f6070c0eaab1e4a46a546a7c40f31ebc90dde74b8365a76220e56097da0d4228
154 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of external URIs and a link farm heuristic suggests the document is designed to redirect users to potentially harmful content. The document body, though heavily obfuscated, contains references to 'beta version of whatsapp apk download', aligning with a phishing or malware lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://traffnew.ru/123?utm_term=beta+version+of+whatsapp+apk+download
    • https://cdn-cms.f-static.net/uploads/4479460/normal_5fa5f07904174.pdf
    • https://nanagimub.weebly.com/uploads/1/3/4/6/134632235/biluxa_napagiw_boxenim.pdf
    • https://cdn.sqhk.co/tadawatimi/hbTifhh/75792828159.pdf
    • https://vesumuzuvof.weebly.com/uploads/1/3/4/6/134685641/48bc7c7d.pdf
    • https://dugizixenopiloj.weebly.com/uploads/1/3/4/4/134457585/af49f70b2fdc.pdf
    • https://bomitepoz.weebly.com/uploads/1/3/4/8/134895739/zikusefidon-vimomo.pdf
    • https://cdn.sqhk.co/pimibopugugo/hfiazS8/field_hockey_defender_tips.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/78a55d43-879b-423a-8c98-2d070d9a5c77/xurofanemozude.pdf
    • https://s3.amazonaws.com/babetafaperaxov/pentek_intellidrive_manual.pdf
    • https://uploads.strikinglycdn.com/files/ccb0dac1-f12f-417c-9d5d-2e519a8cc377/36874589388.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db51.bin
43baa67b50d5af74e1f246dfb632037929a92795a2ba78036713cf7f22ec23f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB51 5392 bytes
font_01_sfnt_off0000edbb.bin
5f0ca85c79c8535a8827331e03c410a8f40d65ff3ef4587d8491e683c92cec6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBB 11360 bytes

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