Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbdca213a7b20257…

MALICIOUS

PDF

80.3 KB Created: 2021-04-27 21:08:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: cb42e378cc11fbe6dadd13fee0fe7f03 SHA-1: 68747a2d97a3be1a746d88178a044b6c95132fc7 SHA-256: bbdca213a7b20257112f48af9c82da326f638e2b14763f018ede9fd48154b2a5
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, characteristic of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the structure and URL patterns suggest the PDF is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://resalured.ru/strik?utm_term=how+to+use+new+home+sewing+machine PDF link annotation
    • https://jejomedilad.weebly.com/uploads/1/3/5/3/135316302/e35b354144c42.pdfIn PDF document text
    • http://busowalukifejel.22web.org/are_water_heater_elements_interchangeable.pdfIn PDF document text
    • https://cdn.sqhk.co/bumadawab/dCufNjj/adelantado_4_aztec_skulls_free.pdfIn PDF document text
    • https://cdn.sqhk.co/mifodirula/WjiTykC/i_love_u_my_angel_song.pdfIn PDF document text
    • https://cdn.sqhk.co/bupedamarib/b2gjQhe/lagufanawod.pdfIn PDF document text
    • https://sijudunewofas.weebly.com/uploads/1/3/4/6/134696620/notinafinijizene.pdfIn PDF document text
    • https://cdn.sqhk.co/vovewotutal/haicggh/download_train_and_rail_yard_simulator_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/puwipaneke/agBjcow/ampeak_smart_charger_user_manual.pdfIn PDF document text
    • https://romizipomubem.weebly.com/uploads/1/3/0/7/130775952/zumujosaz.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
    • http://lapekekefexe.rf.gd/64658940500.pdfIn PDF document text
    • http://zijapipote.rf.gd/ruketabezovirojekawuve.pdfIn PDF document text
    • http://wasamatebupo.rf.gd/booth_multiplication_algorithm_in_computer_architecture.pdfIn PDF document text
    • https://0793e221-2e7e-4176-aae8-4ff4b75d8f7a.filesusr.com/ugd/64bd79_2a7edcd2ade141038aab93b2d7ce01c6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fokapikow/dark_force_rising_books_cool.pdfIn PDF document text
    • https://d90bda3b-35dd-409f-9d4b-b4a00d881a52.filesusr.com/ugd/b88e3d_8d529ba4e2f9432799bcd71ec29f78b7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jixeremipet/gozemelogu.pdfIn PDF document text
    • http://mutojux.epizy.com/what_is_biological_approach_psychology.pdfIn PDF document text
    • https://s3.amazonaws.com/gujutavevive/nagamiwavov.pdfIn PDF document text
    • http://vuripowumi.epizy.com/94303977376.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_off0000f003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF003 5020 bytes
SHA-256: f6c5d135e11ed87ef32018298ccd52ab4c11073e75dda861c058a2d9cb3ae7e1
font_01_sfnt_off000100fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FD 10300 bytes
SHA-256: 1928b2d566163fe55685f4de8ab1816ef789a9830d3c193ab2fbdb92d064c8a8
font_02_sfnt_off0001243c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1243C 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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