Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8d0425d3d638b8d…

MALICIOUS

PDF

81.9 KB Created: 2021-04-01 18:41:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 62a2268c86b151fc54199f99946eeeca SHA-1: 8e1751bcd8a1ad4aa11acd73fa9e30c659b8fe99 SHA-256: a8d0425d3d638b8d853e5352e1ec4fd98557fa24bae3a25a3f4d8bb3696def37
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, many pointing to disposable hosting services, indicative of a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links. The document body is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, which is sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 6

  • 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 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://bologen.ru/wix?keyword=jesus+and+the+essenes+pdf+free PDF link annotation
    • https://wibugosavuzatug.weebly.com/uploads/1/3/4/3/134349607/9293746.pdfIn PDF document text
    • https://cdn.sqhk.co/wukomidekepu/7hdwuic/walking_dead_cast_still_alive.pdfIn PDF document text
    • http://fasoxuxesatilu.sportsontheweb.net/bhopal_gas_leak_disaster_act_1985.pdfIn PDF document text
    • https://cdn.sqhk.co/zolilogifuxe/IOsCieg/atwood_manual_water_heater.pdfIn PDF document text
    • https://zasuzepomuban.weebly.com/uploads/1/3/4/6/134627511/6661e.pdfIn PDF document text
    • https://cdn.sqhk.co/todiwapubu/gj8UgcJ/shooter_games_xbox_one.pdfIn PDF document text
    • https://cdn.sqhk.co/wezupobuwab/jgejjZ7/starfall_logo_history.pdfIn PDF document text
    • https://nifudosuv.weebly.com/uploads/1/3/4/0/134040563/87dd6f697.pdfIn PDF document text
    • https://cdn.sqhk.co/kabevapixox/iahhi1L/dirt_racing_go_kart_for_sale_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/gisatajofo/UjbSXic/e_learning_application_software.pdfIn PDF document text
    • https://romidanunopupef.weebly.com/uploads/1/3/1/1/131163616/2ba6059.pdfIn PDF document text
    • http://livemavuxedu.getenjoyment.net/3681898370.pdfIn PDF document text
    • https://cdn.sqhk.co/bogovureg/hhgoght/skylanders_imaginators_nintendo_switch_gameplay.pdfIn PDF document text
    • http://fukiwurezopukof.mywebcommunity.org/75187231078.pdfIn PDF document text
    • https://cdn.sqhk.co/datawafag/4hfpBBN/hockey_goalie_equipment_cheap.pdfIn PDF document text
    • https://cdn.sqhk.co/seworani/ggjEAz3/14244553376.pdfIn PDF document text
    • https://cdn.sqhk.co/lafuwexale/jcqsEie/monster_truck_racing_games_2_player.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/resabomibogodaw/78738778222.pdfIn PDF document text
    • http://karokifewugasuz.onlinewebshop.net/88882086054.pdfIn PDF document text
    • https://s3.amazonaws.com/dejazuvorira/fusuxam.pdfIn PDF document text
    • https://s3.amazonaws.com/zizene/wugozubijilumapijagik.pdfIn PDF document text
    • https://s3.amazonaws.com/ragejufa/97062789437.pdfIn PDF document text
    • https://s3.amazonaws.com/bogijexu/93287506994.pdfIn PDF document text
    • https://s3.amazonaws.com/dowavelaxam/zubodawigozurerew.pdfIn PDF document text
    • https://s3.amazonaws.com/sakaburepagase/ambiente_escolar_definicion.pdfIn PDF document text
    • https://s3.amazonaws.com/lakujusitejojet/cramerton_nc_police_reports.pdfIn PDF document text
    • https://s3.amazonaws.com/rebesudanolo/the_boy_who_harnessed_the_wind_movie_imdb.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF660 4812 bytes
SHA-256: 2eb8a7580c7d5d2e9f9e733aa347b6bb3f29aa11f0dd1818da6d8da94557c4f1
font_01_sfnt_off0001069e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069E 10868 bytes
SHA-256: 3a858e4e522568d01777f8e459adf394de4b87d39001c0aed91e374830467699
font_02_sfnt_off00012b89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B89 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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