Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5b318158f195c25…

MALICIOUS

PDF

91.5 KB Created: 2021-03-14 13:06:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: c1cf90a46885ea4868f20f08958f1e09 SHA-1: c4d28960105618550340ea27fb2156bc259de9f9 SHA-256: e5b318158f195c257b1da26747f52a7e26f5e69496a4281171ba5aec886c4d67
126 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm and is flagged as malicious by ML classifiers and ClamAV. The document body, though heavily obfuscated, appears to be related to a crossword puzzle, suggesting a lure. The primary malicious indicator is the embedded URL which leads to a suspicious domain, likely intended for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jumiwimov.ru/wix?keyword=capitulo+3b+realidades+2+crossword+answers PDF link annotation
    • http://sochi2026.com/material_science_and_engineering_book_by_v_raghavan_google_booksb596w.pdfIn PDF document text
    • http://theplafond.xyz/what_literary_devicespmnd7.pdfIn PDF document text
    • http://eferevole.com/17871829663c3kvy.pdfIn PDF document text
    • http://gebuhrenfrei-mein.com/is_alexander_the_great_tomb_found61l52.pdfIn PDF document text
    • http://supariwepexafat.mywebcommunity.org/badminton_rules_2020.pdfIn PDF document text
    • http://bapulesaj.mygamesonline.org/pursed_lips_breathing.pdfIn PDF document text
    • http://gefosezidubajoz.scienceontheweb.net/derecho_romano_eugene_petit_libro.pdfIn PDF document text
    • http://xibiselid.medianewsonline.com/sexavixunusozubejokiduxu.pdfIn PDF document text
    • https://lawukexudemodu.weebly.com/uploads/1/3/4/0/134041757/7aa6b6a220b2d.pdfIn PDF document text
    • https://jototafedapabo.weebly.com/uploads/1/3/1/3/131398279/lakotise-witaselizatinuv.pdfIn PDF document text
    • http://kuworekokinig.medianewsonline.com/call_of_duty_cold_war_upgrade_from_ps4_to_ps5.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/90d570bc-9bf9-41f3-acc0-637738a56f81/digital_photography_magazine_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/tidigudetefumof/vivofit_jr_battery.pdfIn PDF document text
    • https://0298dc5a-7924-4276-8279-06452a5288da.filesusr.com/ugd/b30cf0_c38b42cd36ba4f77a9c6029982115ab5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8799da85-89e8-4ce7-b01c-734707b249b6/how_to_say_ute.pdfIn PDF document text
    • https://c30b87d5-e38e-4f4c-8f61-e356d9eaafe8.filesusr.com/ugd/347120_279c0033fe2e44dbb747c90129b18f7b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kitakilesa/nokezowiribebuloruk.pdfIn PDF document text
    • https://s3.amazonaws.com/werowibovezoje/acrobat_adobe_dc_pro.pdfIn PDF document text
    • https://s3.amazonaws.com/pokorevalaxex/vigujesotobawawivoterer.pdfIn PDF document text
    • https://s3.amazonaws.com/mikibetiv/air_force_form_4005.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_off000123b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B8 5500 bytes
SHA-256: e42dec56fd0a728328fa99c64d45d73258cc8066b87d7dc6f4f527a232c2c8e1
font_01_sfnt_off0001367e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1367E 13224 bytes
SHA-256: c6e1d53d3e07fcfc8feaf953af59928b4f173ca42251deac404324afe8d2d0cc

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