Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9e3c4c6d56eb66b…

MALICIOUS

PDF

78.0 KB Created: 2021-04-03 10:16:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 167c0084e37d7d354c261170637be6bd SHA-1: 031e5120dfeef22f8db0f06a79e5bd0a5a5523e3 SHA-256: a9e3c4c6d56eb66bf17f27bdf33f7b0fc0713e043d37665358efcfafc187d09e
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure. The ML classifier also assigned a high probability of maliciousness. The embedded URLs, such as https://crophysi.ru/award?keyword=actuarial+mathematics+for+life+contingent+risks+pdf, are indicative of phishing or malware distribution attempts. Although no scripts were explicitly extracted, the PDF structure and linked URLs suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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/award?keyword=actuarial+mathematics+for+life+contingent+risks+pdf In PDF document text
    • http://kuzojud.66ghz.com/56880914751.pdfIn PDF document text
    • http://luxibenuguk.getenjoyment.net/96269134576.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426090/normal_5fd247aeb8806.pdfIn PDF document text
    • https://cdn.sqhk.co/gatezoru/cwBLzF2/gunato.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374369/normal_6022f94995c19.pdfIn PDF document text
    • https://cdn.sqhk.co/sidogorego/fghDCZ7/99119881385.pdfIn PDF document text
    • https://cdn.sqhk.co/fagiseregu/gUjchcO/83351219154.pdfIn PDF document text
    • https://cdn.sqhk.co/kifateten/gjjjcjh/jowiwomipusod.pdfIn PDF document text
    • https://cdn.sqhk.co/moserusoba/lgc6dhi/56004474320.pdfIn PDF document text
    • https://cdn.sqhk.co/nejajevafode/7Hhhkfw/plague_inc_scenario_creator_apk_android_1.pdfIn PDF document text
    • https://cdn.sqhk.co/wadelovelo/AjhhhfF/ww2_anti_aircraft_gun_range.pdfIn PDF document text
    • http://mivegik.mygamesonline.org/ladizuxek.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/45efc13d-b4c4-4090-baff-a9013f3936ad/what_oil_to_use_on_honda_generator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba24dffa-aafb-4e83-ad52-10943274f65d/lee_2nd_edition_modern_reloading_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bef9aee2-ccc0-468e-9127-3b0e62328598/71040825185.pdfIn PDF document text
    • http://nojikigor.myartsonline.com/the_wanderers_where_are_they_now.pdfIn PDF document text
    • http://zuwitelugo.rf.gd/cutting_edge_vk.pdfIn PDF document text
    • http://newemepakirid.myartsonline.com/p90x3_sample_meal_plan.pdfIn PDF document text
    • http://dexizijisub.atwebpages.com/how_many_electrons_in_4f.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f0a89cd-44a7-4379-acad-78fb09a02a11/difepularikojurekebubutix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9cd78ce-4a1e-445f-af59-af2c42814e39/krapps_last_tape_themes.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_off0000f465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF465 5624 bytes
SHA-256: 07ffd73b1032d1be28462a1f121d8930113091834153bd966b739b68a3d5032e
font_01_sfnt_off00010758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10758 10208 bytes
SHA-256: c94ea999545ae909fcf910562ae223a1e52b54b5b43966c0baebe0c3deee5b9b

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