Malicious PDF — malware analysis report

Static analysis result for SHA-256 275c9ab87f084b4f…

MALICIOUS

PDF

75.6 KB Created: 2021-03-29 11:41:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: dc79b47afed5b53e10be76b76b0456b5 SHA-1: 65038e21341365f956facbeed37b8809b8334aa0 SHA-256: 275c9ab87f084b4f6cda458e31b8420cedd049c0c18debe9a5268ea41dd5815e
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous external URIs, many of which point to disposable hosting and are part of a link farm, suggesting a phishing or redirection scheme. The presence of a seemingly benign document title related to health lures users to click on these links, which likely lead to further malicious content or exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/strik?utm_term=what+should+i+eat+to+have+flat+belly PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4377704/normal_5fc828783062c.pdfIn PDF document text
    • https://cdn.sqhk.co/gasowifozil/l5Pibjc/grand_truck_simulator_2_download_mod_apk.pdfIn PDF document text
    • http://gakesatigefa.22web.org/tumimidab.pdfIn PDF document text
    • http://wimuzawoxi.getenjoyment.net/46653878275.pdfIn PDF document text
    • https://cdn.sqhk.co/rarukaboz/hfHIUjg/notepad_plus_plus_plugins_compare.pdfIn PDF document text
    • http://tifoxikutawe.sportsontheweb.net/gibafugilebixowupukokes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408188/normal_604f4e87268b8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415331/normal_5fc9cbfc0d760.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485710/normal_601dcb4b3290a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pulavokaxe/80545876368.pdfIn PDF document text
    • http://zafurug.epizy.com/dunesafivevigiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c45c4766-d73d-4ab4-9a81-9423c5ade94f/how_much_is_a_bale_of_pine_straw_at_ace_hardware.pdfIn PDF document text
    • https://s3.amazonaws.com/widofafane/wonunexosemobowukeze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a10fbef-a9e1-4cdd-b858-baecf2c9196c/sasulaganebozobe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d36a1d51-de3d-40f6-9a07-c0f21f1da3b8/why_my_samsung_tv_does_not_connect_to_wifi.pdfIn PDF document text
    • http://xoxasosopu.epizy.com/is_camila_in_season_4.pdfIn PDF document text
    • http://zotixawip.epizy.com/list_of_rangers_apprentice_books.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_off0000eafd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFD 5212 bytes
SHA-256: 755724190b09293153fe449b0c712268a9ac1f3a3386a347e95bffb980185310
font_01_sfnt_off0000fcce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCE 10792 bytes
SHA-256: 1dde4c33f84251351d5758c17dbed4d58ac902bde1803bc4176cfec9b9f4ddef

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