Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfa5fe07c68631c4…

MALICIOUS

PDF

80.5 KB Created: 2021-05-01 21:09:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 66e8791a65924325d3ec6f1bb38cea38 SHA-1: 2bdd77fd26ccea97c9f3625fbcc1ff361d04e7bb SHA-256: cfa5fe07c68631c4d3c1a265618a3d662655901fb72f6554ec078659d5660398
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and flagged as link farms, indicating a phishing or malware distribution attempt. ClamAV and ML classifiers strongly indicate maliciousness, specifically classifying it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://golowaki.ru/strik?utm_term=what+are+some+positive+effects+of+cultural+diffusion PDF link annotation
    • http://jinomikezed.iblogger.org/physics_lab_report_example_high_school.pdfIn PDF document text
    • https://cdn.sqhk.co/tememagitapo/hjbjjeK/ww2_fighter_names.pdfIn PDF document text
    • http://evatopshop.xyz/ruger_impact_max_22_caliber_pellet_air_rifle_with_scope_review8brgl.pdfIn PDF document text
    • http://copytoshka.ru/recarga_nauta_wifi_en_cuba167j1.pdfIn PDF document text
    • http://help-mediasupport.com/noworesumokofikakexoteihek0.pdfIn PDF document text
    • https://cdn.sqhk.co/fexivijemozu/WwgcJeq/proper_use_of_ironing_board.pdfIn PDF document text
    • http://axecheat9.xyz/dekelanupowedoluuk8n0.pdfIn PDF document text
    • http://denuziwu.iblogger.org/mathematical_induction_and_binomial_theorem.pdfIn PDF document text
    • http://instgrmmverifiedbadge.com/what_are_the_monsters_in_the_odyssey0eutr.pdfIn PDF document text
    • https://cdn.sqhk.co/fopalixogul/Kgjejay/nerf_gun_zombie_strike_ripchain.pdfIn PDF document text
    • http://gikiwasixe.66ghz.com/38747738304.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f395d2f2-f939-483b-815f-81062d4747ff.filesusr.com/ugd/be2697_02b48d139596465aa0bd435c3f1c9fed.pdf?index=trueIn PDF document text
    • https://ebed6276-6372-4ddf-adad-9a0fa504b99f.filesusr.com/ugd/805d2a_35ab49f84f1b43799920896eec12986a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zodererezuzuxi/31397791303.pdfIn PDF document text
    • http://vimukomexetad.rf.gd/number_sense_worksheets_kindergarten.pdfIn PDF document text
    • https://s3.amazonaws.com/gekojulog/jotarezow.pdfIn PDF document text
    • https://s3.amazonaws.com/makumapikeze/teaching_to_transgress_bell_hooks.pdfIn PDF document text
    • https://s3.amazonaws.com/goneduzum/29290167695.pdfIn PDF document text
    • https://a161ff94-1a6f-4367-b6f8-8e513a5e676d.filesusr.com/ugd/4c7633_2b8d912a0034481f8f70a951797799d8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bajapovogam/74122726451.pdfIn PDF document text
    • https://1b2c4efd-c8eb-4b04-b26f-b9154d704720.filesusr.com/ugd/d3758e_8721fd95dc294693a82bbe6e7e70faaf.pdf?index=trueIn PDF document text
    • http://kujujigufa.epizy.com/20508529131.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE655 5468 bytes
SHA-256: 5cba0bfdb88f8483b50e2530e81f77461e092b5819e833bfc157537f1cd7cecb
font_01_sfnt_off0000f8d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D2 10472 bytes
SHA-256: 74c97a5ada8d098541b38da567eaae8e8b49a0cafa39b1d0bb445c561cc4c792
font_02_sfnt_off00011cc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC4 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15

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