Malicious PDF — malware analysis report

Static analysis result for SHA-256 7af5c4d48b0586ac…

MALICIOUS

PDF

73.4 KB Created: 2021-03-27 22:29:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: c2fa6e85be52cc981a65d043c4f1c766 SHA-1: 8a4a451d48d7657d5bc4d3f1d9ade7fedb7ca310 SHA-256: 7af5c4d48b0586ac85b90367299ff915cdab95c607e08b6ec9c4e6aa54e083f7
66 Risk Score

Malware Insights

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

The ML classifier strongly indicated maliciousness, and the PDF contains numerous embedded URLs pointing to disposable domains, suggesting a link farm or phishing attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the presence of many links on potentially untrustworthy hosting. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest the document's primary purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://nipisod.ru/award?keyword=past+simple+and+past+continuous+text+exercises+pdf PDF link annotation
    • http://nigemutekilum.mypressonline.com/92665671621.pdfIn PDF document text
    • http://nokilibetajew.mywebcommunity.org/neural_networks_and_deep_learning_by_michael_nielsen.pdfIn PDF document text
    • http://ladiluvame.mypressonline.com/apoderado_aduanal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497082/normal_604ddab27d120.pdfIn PDF document text
    • http://lenulari.mypressonline.com/does_tracfone_have_wifi_hotspot.pdfIn PDF document text
    • https://cdn.sqhk.co/mutobudenit/ifjahfl/51407921581.pdfIn PDF document text
    • https://cdn.sqhk.co/zipuzedozame/3jfijhh/cross_border_transactions.pdfIn PDF document text
    • http://jivavesomuviz.getenjoyment.net/55627132797.pdfIn PDF document text
    • https://cdn.sqhk.co/mitukutowum/gcCAz3f/devi_puranam_in_telugu_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409118/normal_5ffe7204bb715.pdfIn PDF document text
    • http://tafasizogir.22web.org/pekixabulij.pdfIn PDF document text
    • http://padakogako.iblogger.org/ethical_hacker_course_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/nilamemiw/jjhmhjO/jaxufo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://satavemuso.rf.gd/download_surah_yasin_latin.pdfIn PDF document text
    • http://patuwab.epizy.com/irobot_braava_jet_m6_wi-fi_connected_robot_mop_reviews.pdfIn PDF document text
    • https://76df98a8-3e94-4eee-a6f5-23e1de06049b.filesusr.com/ugd/54c74c_6bd3761aeb274033b1a8ffc63f2ad41d.pdf?index=trueIn PDF document text
    • https://7095e710-59ac-4d27-8a5a-f3bbcaf65deb.filesusr.com/ugd/418e76_1b6721ee8f074f7c9516a6b35f9ac305.pdf?index=trueIn 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_off0000df4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4D 5372 bytes
SHA-256: 68911c4c7249498fef8e37edcbd01165089299451bef69a45d6bcd08013f88a7
font_01_sfnt_off0000f17d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17D 11024 bytes
SHA-256: 200ab008fd8eafeffd3fcba820d2145c443324ee5d487e078b70b404cc35e82e

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