Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a51cd1626d10407…

MALICIOUS

PDF

79.0 KB Created: 2021-03-08 01:04:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 64334c6ff3c434231ba6e3dff10223ca SHA-1: f70889302323076f58e1b180bba95e28e6c450fa SHA-256: 1a51cd1626d10407d50ee74fabe081ba7a8bb155210b0714fb1233a6653da606
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 is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting a phishing or scam attempt. The presence of embedded URLs and the overall structure strongly suggest this document is designed to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://fokemale.ru/strik?utm_term=personal+faith+statement+examples
    • https://static.s123-cdn-static.com/uploads/4413976/normal_5fe5d1d704a17.pdf
    • https://cdn.sqhk.co/widafopaj/rhjtjAK/44517541102.pdf
    • http://1s.london/how_to_write_technical_skillsedkfa.pdf
    • https://static.s123-cdn-static.com/uploads/4488604/normal_5fe57af71204f.pdf
    • http://sovetnik53.ru/adaptive_asset_allocation_a_primer0e1qy.pdf
    • http://peuly.xyz/judetamugamewuz8an0t.pdf
    • http://sellamorem.com/john_deere_4045t_engine_torque_specs1gtwh.pdf
    • http://ru-dev.xyz/lighthouse_mall_shoe_storesbvk0p.pdf
    • https://cdn.sqhk.co/vefasebo/aNijdjf/vexixiwabororesekinezu.pdf
    • http://premial.su/business_environment_analysisr2wdp.pdf
    • http://hellesypakk.online/520777915401vnuz.pdf
    • https://cdn.sqhk.co/tosuwukiwate/3id0she/guilt_trip_synonym_noun.pdf
    • http://hamlikjorettoop.ru/bakisipanibejikameta8t025.pdf
    • http://wujukoje.iblogger.org/netelarurapen.pdf
    • http://eferevole.com/pawabudiraveni3pmoy.pdf
    • https://cdn-cms.f-static.net/uploads/4382004/normal_5fe652c70a4cb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://doguzikeva.epizy.com/wilton_cake_serving_guide_wedding.pdf
    • http://dupowoza.epizy.com/53276394568.pdf
    • http://xivefasojag.epizy.com/aashto_roadside_design_guide_chapter_5.pdf
    • http://kixixiwibatogit.epizy.com/medicinal_plants_amla_information_in_marathi.pdf
    • http://xaralitotido.rf.gd/food_allergen_information_table.pdf
    • http://rabuwupitakif.rf.gd/annual_leave_policy_template_uk.pdf
    • http://jasigobup.epizy.com/asset_management_value_chain.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_off0000f7b5.bin
702840ae91fe134e0e39c66dac94e1657e4d101e7f883c652b989aea9a8f0c50		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B5 5208 bytes
font_01_sfnt_off00010944.bin
9005ac23b28275a0baad9069f3a6e6ae17f054b502fa0dacf0e6d85def01409a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10944 11112 bytes

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