Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f2346037b8ebb4f…

MALICIOUS

PDF

74.5 KB Created: 2021-03-31 15:43:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 37a998cc7d80caf9ce67842c21072e55 SHA-1: 8a61d7e2d15f0912a4b3d5c0c5f297fcf9ecefda SHA-256: 4f2346037b8ebb4f6383bc2ae58b1c4d389fa7e5323278513689539dd1ba4b92
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ClamAV as a phishing trojan. The ML classifier also strongly indicates maliciousness. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://dafemum.ru/award?keyword=exercices+corrig%25C3%25A9s+sur+le+barycentre+pdf
    • http://penaxuwilamufo.iblogger.org/zaboxaradubolekavuva.pdf
    • http://nupesupo.mypressonline.com/how_to_fold_proform_crosswalk_395_treadmill.pdf
    • http://watodakazo.22web.org/dawapimulu.pdf
    • https://cdn-cms.f-static.net/uploads/4408464/normal_603d2da0f0dd9.pdf
    • https://static.s123-cdn-static.com/uploads/4475197/normal_5fe296d43ea6e.pdf
    • http://beririka.scienceontheweb.net/dell_v313_printer_driver_mac.pdf
    • https://cdn-cms.f-static.net/uploads/4370767/normal_603147ca8ffb4.pdf
    • http://jokojujut.medianewsonline.com/susezodovijif.pdf
    • http://safetugosuwe.22web.org/sojukewunitomulikoresid.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://timavutiziv.epizy.com/87295301640.pdf
    • https://s3.amazonaws.com/vawoginele/89999478967.pdf
    • https://s3.amazonaws.com/bufexa/82513097884.pdf
    • https://d5aacb37-8766-4234-9cc8-c2ec3b911aba.filesusr.com/ugd/1e723b_8a87d58eaf88473984bafef4ae9241e3.pdf?index=true
    • https://ce3a146a-d504-4efb-981c-4593fb85d965.filesusr.com/ugd/5b5da7_681c00506eda488ab5374393cfdbf177.pdf?index=true
    • http://tukutuxobolekub.epizy.com/fojekivizikuwojodusigek.pdf
    • https://00407fa8-a9ef-4b78-9bbe-46147fc8acf6.filesusr.com/ugd/5ecadc_1ed78f3ae7d84f6d943e5246d2cf3394.pdf?index=true
    • https://s3.amazonaws.com/rekawexuretowo/havoc_brothers_album_songs_isaimini._com.pdf
    • http://jawoguvanonamud.epizy.com/writing_decimal_numbers_in_standard_form_worksheets.pdf
    • https://538d8494-0c7d-401a-b890-0485f6bc7bca.filesusr.com/ugd/29c71c_e0d3fa0878c245a6a7b1291d881eb6fb.pdf?index=true
    • http://jaziwovapotulit.epizy.com/games_real_football_2012_apk.pdf
    • http://vepisesilutez.epizy.com/volt_workforce_solutions_information.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df5f.bin
45e9a8e55f714e6bfc890bdca55ba1bd95538aba8416cf6f7a89935310ca3362		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5F 5732 bytes
font_01_sfnt_off0000f2b9.bin
ed82af58ab7a02eea9c3cf9c85715dc857a069879e63f0f46ffeeb8af6d4e583		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B9 12272 bytes

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