Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a4ca57608d24c68…

MALICIOUS

PDF

76.2 KB Created: 2021-03-11 05:40:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 6c7a938d8eef530ad2fcaadfccb802b6 SHA-1: 550a2b83ff7d6ce226f92989f8fc579bca7bf151 SHA-256: 3a4ca57608d24c6845b30663ea8f2d5cfef19b5b5e9b517b7cfc096bbb46a2f7
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains and potentially malicious content, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV also flagged this PDF as malicious, specifically as a phishing trojan. The embedded URL 'https://jottigo.ru/wix?keyword=one+on+one+basketball+unblocked+games+66' suggests a lure to a website that likely hosts further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://jottigo.ru/wix?keyword=one+on+one+basketball+unblocked+games+66 PDF link annotation
    • http://galubiwigo.iblogger.org/aeroplane_song_2018_pagalworld.pdfIn PDF document text
    • http://ritual-venki.online/80937047115jac4a.pdfIn PDF document text
    • http://hamlikjorettoop.ru/87500564720mcjc9.pdfIn PDF document text
    • http://wovogabaposexe.22web.org/arena_of_valour_mod_apk.pdfIn PDF document text
    • http://opendouche.xyz/xepadubawufixinep6abqx.pdfIn PDF document text
    • http://ideal-it.fun/how_to_make_losing_weight_a_lifestylesamk4.pdfIn PDF document text
    • http://lnstagramcopyrighthelps.com/nakubinojaludpq57o.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/jodabiladezot/ieee_format_for_writing_project_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60d72cb2-7a23-46df-b0f7-f4c8cf524bca/85092845562.pdfIn PDF document text
    • https://2d130471-2a64-48ba-87cf-8f1e86c6acad.filesusr.com/ugd/9c43ec_7f9970e981ff465988b1ffa8443077b6.pdf?index=trueIn PDF document text
    • https://8fc1c2d6-49ba-4d63-8b95-0327ef2b1627.filesusr.com/ugd/1849a1_6f3a21dad95942f3aeb7cd65c0dc0f4c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e6d6db3-662b-42f5-8515-0018518809a6/schwinn_recumbent_bike_problems.pdfIn PDF document text
    • https://s3.amazonaws.com/tokafanawa/28151413784.pdfIn PDF document text
    • https://c31d65df-273c-4bcc-acfb-7b03b0724b99.filesusr.com/ugd/e7e4a0_3c98c82ac4b74c41b4ce9886cc686fb7.pdf?index=trueIn PDF document text
    • http://wexadelovatapox.rf.gd/40085365713.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3488f414-58f4-413b-a0b8-f81b027068ba/salary_of_ccna_in_canada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2255c57c-af0a-4e3f-b2c7-c905b4ad6b6d/59001027641.pdfIn PDF document text
    • https://s3.amazonaws.com/jaxesabi/ganipipisiwowilawifo.pdfIn PDF document text
    • https://da18e6a8-d720-42de-a88c-3f13daad7efb.filesusr.com/ugd/08fe48_ce4e9e25e2e843a7a940081309ad1437.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/divelatoxa/8036430118.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5eb72bf-ada4-4151-ba9e-e29ab5b47fb1/rupedesenuvawigafuki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ecbbb09-ad89-4246-b38e-13ebb70b717b/final_fantasy_xv_ps4_pro_vs_xbox_one_x.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2f8837a-de29-4212-aceb-d6952ed3b48d/what_is_the_purpose_of_the_canadian_criminal_justice_system.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_off0000ebcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCD 5548 bytes
SHA-256: 9bb75553e555438a0b7dc08e8cfa7e2095bf3d9d9c5215fd954dd0ed4ff4b8f5
font_01_sfnt_off0000fe91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE91 10696 bytes
SHA-256: 797c49932880687cf369dcd5f892db6d778457093447e4aa816a1bc3354410cf