Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0f8efbf00692258…

MALICIOUS

PDF

91.1 KB Created: 2021-03-14 15:33:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 122a0aa617b142425db16b8e832c0efc SHA-1: f5e86ea5b877cbb739cae12e807cf2a5dec383c7 SHA-256: a0f8efbf00692258319e296c758bd123e3c949f52ca7f03960cb39e5f9bc289c
254 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document contains a critical heuristic firing for a malicious redirector link, pointing to 'https://crophysi.ru/award?keyword=creative+writing+curriculum+guide+pdf'. Additionally, a 'Browser extension / update installation lure' heuristic indicates a social-engineering attempt to trick the user. The ML classifier and ClamAV detection further support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://crophysi.ru/award?keyword=creative+writing+curriculum+guide+pdf In PDF document text
    • http://desurobiv.22web.org/refuvuwuj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bajapovogam/darrell_sheets_house_tour.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eea4fb81-4028-43a5-8427-1eabd024d041/how_to_clean_the_inside_of_a_masterbuilt_electric_smoker.pdfIn PDF document text
    • https://8316a071-1c81-4729-bbc9-bb84f51c1359.filesusr.com/ugd/b2ba6b_9dcfca6ae87745229439a711637d7ccd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/271a86b1-796e-4cac-a09e-3e4861c9653a/cuanto_es_2_1_4_pulgadas_en_milimetros.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7765774-44d0-405c-9237-b0b85bb98530/17534051605.pdfIn PDF document text
    • https://s3.amazonaws.com/temujonuwu/bifufaber.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1055912a-7192-408a-bb63-22f96721518d/gozarejugo.pdfIn PDF document text
    • http://fenizedotukodi.epizy.com/wasinokizetov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14fec53d-92a4-4f65-b36b-340b7c90c378/what_is_the_symbol_of_initial_velocity_and_final_velocity.pdfIn PDF document text
    • http://ratosore.epizy.com/rizekofuwevesevisozuza.pdfIn PDF document text
    • https://s3.amazonaws.com/jixerubowi/bdu_uniform_philippines.pdfIn PDF document text
    • https://5c817321-7c0c-448b-959d-deb1da9fd788.filesusr.com/ugd/19103d_c655948470f74a98bd961a2ff6638399.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mefadedosuw/ropufigenebap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d384fd3-1efb-4008-be56-1e1c448c58fc/wildgame_innovations_xb380_crossbow_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b30e1721-b538-4555-8908-55f03a2fa748/zefozekoluru.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12556 5356 bytes
SHA-256: 30d4b0cc34788c24bd9e19ca81a4e85f8478d4e878cc78a727ff647d1c397bb2
font_01_sfnt_off0001378e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1378E 11268 bytes
SHA-256: 530badd9d1ba57607c7d2b5100a34bc80e659c8d0279ca785740146a5a663d2a

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