Malicious PDF — malware analysis report

Static analysis result for SHA-256 16df6017a9c0d2a0…

MALICIOUS

PDF

79.4 KB Created: 2021-03-27 15:51:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 80fc6487660eb7ee1467f3dfcb0b55fe SHA-1: b2966c8ac9a787fbe5986b300607eaf25c40945a SHA-256: 16df6017a9c0d2a0395513d20613e7a33773491cbc45dbfe3960f0c3b0582a06
156 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 for SEO link farming or to redirect users to malicious sites. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of such links. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to lead users to compromised or malicious web content.

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://kuzutuzo.ru/strik?utm_term=ap+calculus+multiple+choice+questions
    • https://novebeze.weebly.com/uploads/1/3/3/9/133997241/xisolunusuredusa.pdf
    • https://sujanumijixedi.weebly.com/uploads/1/3/4/5/134501714/5888844.pdf
    • https://solugelefeko.weebly.com/uploads/1/3/0/7/130740562/8840450.pdf
    • http://maddot.space/pepusopipeg1bmg6.pdf
    • https://vikakexotokipo.weebly.com/uploads/1/3/0/9/130969200/kutip.pdf
    • http://inscarusa.info/xavixumuucstu.pdf
    • https://situtewazugigev.weebly.com/uploads/1/3/4/2/134265876/semebesedux-kafefef-xafevob.pdf
    • https://finuvowevemez.weebly.com/uploads/1/3/5/3/135397693/mutumesevufux-jitadigu-fopetufawuxopif.pdf
    • https://sojutobifedurex.weebly.com/uploads/1/3/4/5/134588439/diruwubeteguzudaruj.pdf
    • http://pesowulil.iblogger.org/alter_ego_5_free_download.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tikoweravisixu/string._format_example_lua.pdf
    • https://s3.amazonaws.com/pobixedele/18601277579.pdf
    • https://s3.amazonaws.com/ganubifirigevi/a_crystal_of_time_free.pdf
    • https://s3.amazonaws.com/nonipesikiri/tibalepam.pdf
    • http://bivipazom.rf.gd/birds_name_in_english_with_pictures.pdf
    • https://s3.amazonaws.com/gurafoga/champion_song_pagalworld._io.pdf
    • https://s3.amazonaws.com/palevijuj/what_is_a_narrative_argument.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_off0000fb0f.bin
b647358284d00d5b4246b46c0aa83098cbeccad1b77957b9e2195655c493f30a
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0F 5192 bytes
font_01_sfnt_off00010c97.bin
8c8c73f69442eeb4aa90ec006df86df6534013d32ac0c8117cf8b943ee083cd1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C97 10636 bytes