Malicious PDF — malware analysis report

Static analysis result for SHA-256 3acf7190b6363a82…

MALICIOUS

PDF

69.2 KB Created: 2021-04-12 14:08:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d47cccb4a15ae21ea699dba9b7a89d13 SHA-1: de44793d96ceea57d16106b01dc6728f33171aef SHA-256: 3acf7190b6363a826f643218b0de796638169d6025e62ace7cf4f3b1e124b63d
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a technique often used for link farming or to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as phishing and potentially a trojan. The presence of external URIs and a link farm heuristic suggests the primary goal is to direct users to potentially harmful 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://midufefew.ru/strik?utm_term=odd+thomas+movie+trailer
    • http://telozurilesojo.sportsontheweb.net/gowixuj.pdf
    • https://letemoxitaja.weebly.com/uploads/1/3/4/4/134475957/rutedusetuper-wixumekuk-direvirenisaze-xilukuga.pdf
    • https://cdn.sqhk.co/kososojog/Nsxgiez/27234009891.pdf
    • https://cdn.sqhk.co/mezutorixo/s4yhdf6/ping_pong_ball_pinball.pdf
    • http://naliputa.mywebcommunity.org/21676132087.pdf
    • https://zavamemedu.weebly.com/uploads/1/3/4/3/134305249/3a02966.pdf
    • https://cdn.sqhk.co/wenewojufaj/jfjfShb/44637420119.pdf
    • http://zutumufedige.getenjoyment.net/37425918796.pdf
    • https://cdn.sqhk.co/fofodafexadu/gjyihhf/jamefilokit.pdf
    • https://cdn.sqhk.co/jabisopomuxo/cbgighz/dragon_hunter_crossbow_vs_lance.pdf
    • https://cdn.sqhk.co/kevovevude/ijggibe/92036872505.pdf
    • https://cdn.sqhk.co/dojiwazufek/bidLVXY/bouncy_castle_pgp_maven.pdf
    • http://penafur.scienceontheweb.net/digaxufebumowovonobiji.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/1c7bea45-63e5-4ac4-affa-f3eacf031fd6/14444313041.pdf
    • http://xevijojikutep.onlinewebshop.net/75761621219.pdf
    • https://uploads.strikinglycdn.com/files/75f1c07e-75d4-47ab-ba06-16e1b5c59ba6/name_the_national_game_of_canada.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_off0000ceba.bin
cd4d08a17b675fef99cea6fc46cb9b62552b3f69d3794054e4d45678fc9ae4b7
pdf-font-stream PDF embedded font (sfnt) at offset 0xCEBA 5152 bytes
font_01_sfnt_off0000e00f.bin
48afe4f750fdf012b20716077b7bbfe146107d6147951e63bb4552e9a1aec679
pdf-font-stream PDF embedded font (sfnt) at offset 0xE00F 11268 bytes