Malicious PDF — malware analysis report

Static analysis result for SHA-256 56c83d990b9b0b69…

MALICIOUS

PDF

88.6 KB Created: 2021-04-02 11:41:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 4c943609fa8c3f467c393105aa95c4a3 SHA-1: cf0c745e4da5e51de36c59bf0b37b05d59127c07 SHA-256: 56c83d990b9b0b692d3d5a2ec71d545516a66a43e1c67f6e6edec26c372adada
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting or link farms, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/wix?keyword=northstar+digital+literacy+learning+guide PDF link annotation
    • https://cdn.sqhk.co/libibajuzumu/hhhbha2/webajesakis.pdfIn PDF document text
    • https://cdn.sqhk.co/dasewugiru/icgihfC/westwing_home_living_munich.pdfIn PDF document text
    • https://cdn.sqhk.co/vaxarogajib/ii2hd4w/elite_hockey_prospects_2007.pdfIn PDF document text
    • https://cdn.sqhk.co/zudilubal/WJMHZBq/50310082862.pdfIn PDF document text
    • https://cdn.sqhk.co/bupedamarib/giKSgf1/offline_poker_games_free.pdfIn PDF document text
    • https://cdn.sqhk.co/gizoxemovefi/i3ge4ii/define_feudal_system_in_the_middle_ages.pdfIn PDF document text
    • https://cdn.sqhk.co/baxajufim/ifgGhcJ/59437740855.pdfIn PDF document text
    • https://cdn.sqhk.co/nuxarufodir/gcOihif/bike_games_free_download_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/getabemuto/3Nh3Ug8/momakugufimerolujusuv.pdfIn PDF document text
    • http://loletopuwiv.iblogger.org/detolaguxogajijoviwokibi.pdfIn PDF document text
    • http://italywom.space/hollywood_horror_movies_in_tamil15are.pdfIn PDF document text
    • https://cdn.sqhk.co/losokifape/iaigifZ/best_pickup_truck_to_buy_2020.pdfIn PDF document text
    • http://telgrm.site/melemoliniluzodadonimemoeabot.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb64f5a1-fc12-4500-86ec-81e7d03831cb/how_to_use_epson_gt-s50_scanner.pdfIn PDF document text
    • http://pixajofa.rf.gd/baseband_and_passband_signals.pdfIn PDF document text
    • http://wozaxanakix.epizy.com/jizesewuduwepoxisupeti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82f4dafd-d628-4a2e-b9f9-4b12cb7a7b16/37184686188.pdfIn PDF document text
    • https://s3.amazonaws.com/wujafivabipo/pediatric_resuscitation_guidelines_aha.pdfIn PDF document text
    • https://s3.amazonaws.com/jamuluvuvava/98625868304.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0123e93c-9e83-4670-a64d-681c32edb613/how_tall_were_the_giants_in_the_book_of_enoch.pdfIn PDF document text
    • http://rurudowofalav.rf.gd/93768007132.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_off00011d21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D21 5272 bytes
SHA-256: f58b62fa1c90947448ef8c4b620d612302e0ff1efb5f3db332da445c24fa3e92
font_01_sfnt_off00012f16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F16 11252 bytes
SHA-256: 6f0c09c7dcc8954b55695657dacaedfbebda632914f1e4b86653f9848e1c22bc

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