Malicious PDF — malware analysis report

Static analysis result for SHA-256 987ea4b8727802cd…

MALICIOUS

PDF

76.1 KB Created: 2021-03-21 11:47:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: afe20115b46c789424683d19adae9ef0 SHA-1: 71822161a0d62e808b961c3467099f792d0d150d SHA-256: 987ea4b8727802cd8dc6b01f2844000f7659a268969c1087accbb0c0d8dde219
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, which is a common tactic for phishing and malware distribution. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were extracted, the presence of numerous URLs suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://kuzutuzo.ru/award?keyword=cell+biology+pdf
    • https://cdn.sqhk.co/wametofenuwo/jFxjbqn/showers_at_festival.pdf
    • https://lodokevez.weebly.com/uploads/1/3/4/4/134476034/dobasitedero.pdf
    • https://wipolupenigikof.weebly.com/uploads/1/3/2/7/132712614/negemuxokekakotoloke.pdf
    • http://dujifasuda.iblogger.org/38823004714.pdf
    • https://cdn.sqhk.co/jidevumedure/igcjdZ2/datizujav.pdf
    • https://static.s123-cdn-static.com/uploads/4503584/normal_5fd0909cc40b2.pdf
    • https://nijasofefovo.weebly.com/uploads/1/3/4/7/134719995/1245564.pdf
    • https://ledapenilodaro.weebly.com/uploads/1/3/1/0/131070651/rikupes.pdf
    • https://cdn.sqhk.co/ramawuvade/iPHQgEG/anime_sticker_for_gb_whatsapp.pdf
    • https://cdn-cms.f-static.net/uploads/4376869/normal_601ff280709d7.pdf
    • https://cdn-cms.f-static.net/uploads/4453332/normal_602b93d502940.pdf
    • https://cdn-cms.f-static.net/uploads/4458389/normal_603d97a5dc5e4.pdf
    • https://static.s123-cdn-static.com/uploads/4420599/normal_5ffa1b1b2d759.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://3a0d5408-2ea1-4258-8d29-5d96341cad2c.filesusr.com/ugd/79cb75_0ab393e8ecef41dc924c31bdcd47b761.pdf?index=true
    • http://gitavini.epizy.com/the_mortal_instruments_city_of_bones_movie_2013.pdf
    • http://nidikofuwovi.rf.gd/charlotte_s_web_worksheets.pdf
    • https://43a2ba88-5de9-465b-b95f-6a4d82f2d06e.filesusr.com/ugd/dcbeda_5da85a6df5514a53b03661a64355ab20.pdf?index=true
    • https://a804c8a8-fdf7-4fba-b19b-c23aecc29597.filesusr.com/ugd/a7074a_1d277de0b73a40079e8a212f5b9e0e07.pdf?index=true
    • https://66f9c2bc-82a6-463d-9ccd-9c94d3d8805e.filesusr.com/ugd/b361c6_cec327284695489dae33ce54e85a1e61.pdf?index=true
    • https://e028ba52-6c86-493e-86b7-fecf7cd1c3eb.filesusr.com/ugd/bcb9fd_dce0d465604144c0b91900c204f32eaf.pdf?index=true
    • http://pebenuxotuk.epizy.com/15793515.pdf
    • https://fad58b31-c538-4d3f-828d-7998eec853b9.filesusr.com/ugd/7e6083_7a4b8370f926421e9d3d5be07562f19e.pdf?index=true
    • 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_off0000ec53.bin
d04755f5c7a9c1c294657a021b94d3f546c0f32a5f7a0179130e285604f3c001		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC53 4872 bytes
font_01_sfnt_off0000fd05.bin
19a1218abafaeb8552736b95d4a685cca83ee93d046374b46194b07f09080135		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD05 11144 bytes

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