Malicious PDF — malware analysis report

Static analysis result for SHA-256 beb28866d22381b9…

MALICIOUS

PDF

128.0 KB Created: 2021-03-11 11:42:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6db851870e85f93b9b3d2b79ea744a52 SHA-1: 204363d072d5a8624f9f34e90a2c160ceb117885 SHA-256: beb28866d22381b916d030daf68b7f549a30cbe94ea24ac3ae09a22138afef26
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, suggesting it's part of a link farm or phishing campaign designed to redirect users to malicious websites. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://ponafet.ru/award?keyword=buenos+aires+metro+map+pdf
    • https://cdn.sqhk.co/vaxizavex/BJhiWSy/star_market_deals_rewards_program.pdf
    • https://tixovokibena.weebly.com/uploads/1/3/4/1/134109053/f747a54b0.pdf
    • https://cdn.sqhk.co/sezunofubuzi/0WLUie0/query_to_find_object_id_in_sql_server.pdf
    • http://jurelireroxux.22web.org/funny_puzzle_questions_with_answers_in_marathi.pdf
    • https://vebaruroximowut.weebly.com/uploads/1/3/4/3/134342498/3791644.pdf
    • https://cdn.sqhk.co/wugotiparo/GnjaJEh/80966309777.pdf
    • https://cdn.sqhk.co/mivezifov/Ajiij3b/44483264934.pdf
    • https://cdn.sqhk.co/nobixapo/KLwjaif/80418658967.pdf
    • https://cdn.sqhk.co/vasibejovej/NLdhahi/43192119986.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jigezadoxari.epizy.com/jexunofonevedowuzeju.pdf
    • https://uploads.strikinglycdn.com/files/fab6ccc9-de23-4570-b3d3-cdf4e6303855/what_are_the_four_training_principles.pdf
    • https://uploads.strikinglycdn.com/files/40e4da71-b844-4d5a-9e16-24126654969d/sikezofiniwodij.pdf
    • https://uploads.strikinglycdn.com/files/14fcfa8b-dd0f-4f57-a189-d53386e5c712/97965942571.pdf
    • https://uploads.strikinglycdn.com/files/5824b27d-11e5-4689-b186-d28a5495221e/flower_of_life_pendant_meaning.pdf
    • https://uploads.strikinglycdn.com/files/835180bd-f0ad-403d-bff0-f44cf1f5a54a/94330373307.pdf
    • https://uploads.strikinglycdn.com/files/15e9483a-b7ef-48eb-bbc8-daa2d98d652d/easy_calculus_problems_and_answers.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_off0001b217.bin
623ed78b7e8efd1b7174cc953d02284830dc7e88e032dc9d266741b7834a3eac
pdf-font-stream PDF embedded font (sfnt) at offset 0x1B217 5204 bytes
font_01_sfnt_off0001c3b6.bin
e97b637297780e4e25157824c54af78158ebbd3a42babe449cd165d8279c43d9
pdf-font-stream PDF embedded font (sfnt) at offset 0x1C3B6 15296 bytes