Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d5fadf131aac973…

MALICIOUS

PDF

139.0 KB Created: 2021-04-08 21:56:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 371a5015e6bb32046f94ab9c89675175 SHA-1: 2a5b2de2c4afc62be2ee68e6d16ccebdf7e20414 SHA-256: 0d5fadf131aac973e73522b7a3011edac24ba02d9706bf0b1552161603f447ad
124 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated and appears to be junk data, suggesting the primary function is link redirection rather than content delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=the+history+of+sexuality+foucault+sparknotes In PDF document text
    • http://trixy-matrix.space/lukowebofubivikamv8j5i.pdfIn PDF document text
    • http://wavulefarunatev.iblogger.org/62094934652.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495838/normal_5fcfed241926c.pdfIn PDF document text
    • http://sarkife.site/17091485177wus4i.pdfIn PDF document text
    • https://sedonefuwetupo.weebly.com/uploads/1/3/4/6/134669082/4485984.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501231/normal_5fe22741738e2.pdfIn PDF document text
    • http://taptopbot.com/crypto_clickers_crypto_idle_gamepzui2.pdfIn PDF document text
    • https://fapopadiwa.weebly.com/uploads/1/3/1/4/131438416/193bb9a.pdfIn PDF document text
    • http://domen3.club/liwavabopoxibisetifumatio3fks.pdfIn PDF document text
    • http://varistop.site/how_to_add_audio_track_to_garagebandmjb2e.pdfIn PDF document text
    • http://oneitstore.pro/is_500_horsepower_fastygvfl.pdfIn PDF document text
    • http://bobr.space/how_do_relationships_among_organisms_help_energy_and_matter_flow_through_an_ecosystemqdfv0.pdfIn PDF document text
    • https://gavuzolarot.weebly.com/uploads/1/3/4/4/134458525/gulofasaboda-veluki-ponutenoke.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424331/normal_5fd322fa4c3d2.pdfIn PDF document text
    • http://world-wild-shop.com/pogokodedidazatimojora4s06b.pdfIn PDF document text
    • https://bixagitiwor.weebly.com/uploads/1/3/4/6/134618264/9581894.pdfIn PDF document text
    • https://zexakadobad.weebly.com/uploads/1/3/2/6/132682290/7984773.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://kudopijoxeloxov.rf.gd/jafipomovixonevazorige.pdfIn PDF document text
    • http://vujofif.epizy.com/new_bengali_song_audio.pdfIn PDF document text
    • http://xirasajizobopa.rf.gd/xazapi.pdfIn PDF document text
    • http://ziwitiko.epizy.com/5473166648.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001227c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1227C 60772 bytes
SHA-256: 576fab4c8d297a7879fbd44201bbc29c1d298228e70d9b95b68509ab3ff1bbf6
font_01_sfnt_off0001d846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D846 5168 bytes
SHA-256: 6b1d1a2285364215ed81071d0bd4c0bf1671246fe1ee2baaf18f301f5ff59968
font_02_sfnt_off0001e9de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E9DE 11156 bytes
SHA-256: c2e16ffe04e2d70e828c5ab284a6a6a3e10cd5073a3524a8a11f73df48479a4e
font_03_sfnt_off00020fad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20FAD 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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