Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cf2fb5c73da538b…

MALICIOUS

PDF

80.7 KB Created: 2021-03-07 04:40:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5d1b1a72b281a9223cb1f11e3a8c0ddb SHA-1: 1624e5a7fd405633e7bc50b9c86f781c4c223b00 SHA-256: 3cf2fb5c73da538bc83c84ebcb1a8e64f12dcbf290c3a09b35214468c9f3efbb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URIs, with a significant portion pointing to disposable hosting domains, suggesting a link farm or redirection scheme to deliver malicious content. The presence of multiple external links and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly indicate an attempt to trick users into visiting potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://resalured.ru/123?utm_term=axe+vs+old+spice+reddit PDF link annotation
    • http://tijukilebag.getenjoyment.net/how_to_manage_disruptive_classroom_behavior.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495846/normal_602a0410395c1.pdfIn PDF document text
    • http://zixivudu.getenjoyment.net/wavezinopix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458163/normal_603133bbdc58b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383801/normal_5fc89414b8910.pdfIn PDF document text
    • http://obschee.xyz/zoguwakesexi046bk.pdfIn PDF document text
    • http://ital-girl.space/xiwemadubavemuwowuwoxipulc4vrn.pdfIn PDF document text
    • http://shoop-fg.ru/is_there_a_reset_button_on_my_hvac_unitka20e.pdfIn PDF document text
    • http://trysoda.club/56310626793athsg.pdfIn PDF document text
    • http://vufajed.getenjoyment.net/logitech_g900_chaos_spectrum.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424347/normal_5fd61578c3e1c.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/760ea651-665d-4936-b7bd-cecf0877887f/vunupip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4af3488b-7de3-4d3b-aec9-227341aa0281/the_heirs_episode_2_eng_sub_facebook.pdfIn PDF document text
    • https://923a8ca3-316b-4844-b38f-9bc955ad4852.filesusr.com/ugd/312e0e_55198a709e614f3db8869af27bb6a480.pdf?index=trueIn PDF document text
    • https://52431b39-7396-4b0c-bcaf-ab72d449a1bf.filesusr.com/ugd/f8cef3_e5819299bf0e4741a87e35926f765643.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fcc860c-6af7-4c9a-bf8b-2d274f8f93be/pufapivoxi.pdfIn PDF document text
    • http://dopovis.myartsonline.com/the_yoga_anatomy_coloring_book_pose_by_pose.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9c25807-b17a-46b2-a342-fec5647290b1/integration_of_cos5_x_dx.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF743 4976 bytes
SHA-256: 36f446a0d664ad6fda7da9640a626580cd3f5848426f39f814746e10db93ee93
font_01_sfnt_off00010842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10842 1800 bytes
SHA-256: e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d
font_02_sfnt_off000110d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D0 10728 bytes
SHA-256: ce9cf5a485ceb4271e336feb162e3b3b609e290b8d80f97f04e60dd062da9912

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