Malicious PDF — malware analysis report

Static analysis result for SHA-256 72cb35cdbd25ddda…

MALICIOUS

PDF

78.4 KB Created: 2021-04-16 18:46:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a506198e60ed494aba742e9b3a3d8dcd SHA-1: 349a94a5eb8317886b841146013c4ddc71b8d948 SHA-256: 72cb35cdbd25ddda6835d2eabc6a30bc2c7154c6c986ef299387eddb744fa2f4
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The presence of external URIs and link farm heuristics points to an attack pattern focused on redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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 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://zajinet.ru/strik?utm_term=ghost+boy+book+online+pdf PDF link annotation
    • http://prizinsta.site/alexander_movie_songs_freeg2n13.pdfIn PDF document text
    • http://bazunujovi.scienceontheweb.net/tecumseh_small_engine_parts_canada.pdfIn PDF document text
    • http://instas.site/pirates_of_the_caribbean_piano_music_sheetnh3rm.pdfIn PDF document text
    • http://vizionsmc.net/tilazajobofelutadizewuyscmb.pdfIn PDF document text
    • http://tibudirowe.mygamesonline.org/the_overcrowded_barracoon.pdfIn PDF document text
    • http://biniwitovo.mywebcommunity.org/tafadesimorejawubinuguni.pdfIn PDF document text
    • http://remontnatali.ru/heating_and_cooling_curve_review_worksheet_answersdbix9.pdfIn PDF document text
    • http://oneitshop.info/2341844313ewiev.pdfIn PDF document text
    • http://clebohets.xyz/is_sql_worth_learning_20219qku3.pdfIn PDF document text
    • http://yoga-italy.space/what_is_the_message_of_the_story_the_little_prince_brainlyz9kpa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://550dfcec-0280-4316-a0d5-68b74a7a20b9.filesusr.com/ugd/f59309_b462b67d265c4568add96334c7cd5b15.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vososasoxumete/battletech_dlc_mechs_list.pdfIn PDF document text
    • https://s3.amazonaws.com/buponuwebi/non_abelian_group.pdfIn PDF document text
    • https://883cd1dc-02d0-4059-8fa2-99201f92b631.filesusr.com/ugd/6166c9_846ed7b1a6254413853cfcdfaa91f087.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1144b5b-239f-412c-99b0-fe506d30c27a/why_is_my_lg_tv_apps_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/018beb10-6c61-44b3-8f84-732100703ff6/4076455234.pdfIn PDF document text
    • https://4121a797-204a-431c-92a8-8e24072fb342.filesusr.com/ugd/b972d5_2da3a7a192224b9dbf0179f5d02ca4da.pdf?index=trueIn PDF document text
    • http://ferodibev.onlinewebshop.net/autonomous_vehicle_system.pdfIn PDF document text
    • https://78e27e65-9996-4239-a63d-7a21722db537.filesusr.com/ugd/03f576_3be8650e16704b169cf65788fd8c55ca.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8282f21d-6318-427e-a521-18ec49e3791d/how_do_you_fix_a_motion_sensor_light.pdfIn PDF document text
    • https://s3.amazonaws.com/dazuxujepov/oval_label_template_10_per_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32334eac-61ae-4127-aaf0-6361dc87d0a5/what_are_ethical_dilemma_examples.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatofubote/iso_9001_clause_7.5.pdfIn PDF document text
    • https://a7da3e60-63c8-46c1-a846-eab7df628ed2.filesusr.com/ugd/bba345_10208ba075934dee8e9f1576d344dfff.pdf?index=trueIn 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_off0000f57e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57E 5160 bytes
SHA-256: 8873b5c2e1b9fba4315319373a82eb4f15373d99655787e65c7b925d9c4145f8
font_01_sfnt_off00010710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10710 10848 bytes
SHA-256: 7bea4290857cadf1a1d54b67caefb793380d8746735fe9ef85b67b998c052a17