Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f3ee0e3f8ca4db9…

MALICIOUS

PDF

75.7 KB Created: 2021-03-06 22:11:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: dabfb1a61d95e27347bece98c1d89474 SHA-1: 91c9531dec2e6062dc18348caecf836d8e9dc4fa SHA-256: 8f3ee0e3f8ca4db97e90478513c62c799388a31a0f961beb29c0a4b483e60451
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting, and one prominent URL includes a search term suggesting a lure for popular media content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using numerous links on low-reputation domains, often with UTM parameters, to obscure malicious destinations.

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://maypoin.ru/123?utm_term=under+the+dome+season+3+episode+1+free+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4379387/normal_5fe51e73ee207.pdfIn PDF document text
    • http://zugapuvu.mywebcommunity.org/your_wish_is_your_command_youtube.pdfIn PDF document text
    • http://tefitagesev.mypressonline.com/vimimoraletopoxowapekokej.pdfIn PDF document text
    • http://wuwodijutorem.iblogger.org/what_are_the_5_linear_draw_commands_in_autocad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406812/normal_601e7879752cb.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/44f9b446-023a-472b-89a1-db9aa98737bc/dasetatikomanofunebiju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7e2f5e4-3e28-45b2-a871-5c4591113e10/what_is_the_meaning_of_standard_operating_procedure.pdfIn PDF document text
    • http://vedagavizevuwu.rf.gd/xasinezodusakixatukan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6976044-0ff2-4624-86a6-b9f0b446287c/cannon_gun_safe_electronic_lock_replacement.pdfIn PDF document text
    • http://saninov.epizy.com/78323795940.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99344a24-c3eb-46fe-8f30-abd80bee2fee/gawikeroludepovepono.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a208bfad-73ac-4194-b710-7cdc0e78fe92/hp_8625_change_ink.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcce7cee-d697-46b3-919e-00d8b67277f2/how_to_write_a_book_for_dummies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ad9126e-63cc-497e-879d-5a8c54e34218/how_to_connect_a_rca_remote_to_a_panasonic_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48054bb2-0962-4a4e-a2d3-92267e55015c/nafosotofotewajojonaposug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bf04f28-989f-4196-8f62-3c559f2baa2d/32938486713.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d34814f0-7ccc-4023-be90-37628e482a75/hnsel_und_gretel_film_2007.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57a100f6-2aa8-44f7-81bb-ac2e66bc3e2a/77951216375.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fddf283a-87d5-452c-aa0d-3e90abdeae1f/xuvezukofav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee4aaa09-7b0a-414e-b491-c9ec918859a4/36753013227.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_off0000e8a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A0 5580 bytes
SHA-256: bb0e85bd3dcc8b8246424b87cd7e4408227609c30edefdcd0606beeb9b4809ce
font_01_sfnt_off0000fb8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8F 11124 bytes
SHA-256: c6363ca22dd3558986bcb80152132ffef719f2b3c5a34d8dfc09ed3af7177559