Malicious PDF — malware analysis report

Static analysis result for SHA-256 a55535faa9f25115…

MALICIOUS

PDF

80.8 KB Created: 2021-05-04 13:24:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 479adc0a8dd5af0644bb0b56dd0bd7c7 SHA-1: 4aaa47b50fac17bcbeb17acd4e74e831b5f623f8 SHA-256: a55535faa9f25115452b425df4cb27482ae6f2d65e7e01e2390f1b6f327a0ef3
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or scam attempt. It contains a large number of external links, many of which are likely part of a link farm designed to obscure the true malicious destination. The primary malicious URL identified is https://pelibifir.ru/strik. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links suggest an attempt to redirect users to malicious content, potentially leveraging embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/strik?utm_term=lg+24lb451b+service+manual
    • https://cdn-cms.f-static.net/uploads/4420906/normal_60216ac163efe.pdf
    • http://kononameve.mywebcommunity.org/best_ebook_reader_app.pdf
    • https://static.s123-cdn-static.com/uploads/4378153/normal_5ffde20c81d5e.pdf
    • https://static.s123-cdn-static.com/uploads/4424953/normal_5fe2b55b914d6.pdf
    • https://static.s123-cdn-static.com/uploads/4418385/normal_5fe18dd562302.pdf
    • https://cdn-cms.f-static.net/uploads/4380228/normal_5fe9c8043192f.pdf
    • https://cdn-cms.f-static.net/uploads/4368487/normal_606e7c7461f2b.pdf
    • https://cdn-cms.f-static.net/uploads/4458826/normal_605b85fed41d3.pdf
    • https://cdn-cms.f-static.net/uploads/4487409/normal_60338ef242ec2.pdf
    • http://lokubakodo.getenjoyment.net/gudeziwujadudus.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://2eda13a9-9e0f-47dd-bbfa-a9a5028a3314.filesusr.com/ugd/61c57f_cc1cec6f9197422c803a682b898c1195.pdf?index=true
    • https://uploads.strikinglycdn.com/files/edbb95eb-ecde-4bef-a114-566a50eeae24/5490615875.pdf
    • https://ad177677-9664-42cd-9bf2-17a10eef6e1d.filesusr.com/ugd/f8915e_6f123dadc5e3426681d13809f0ba6429.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e1398b67-c549-4f56-9f5d-963ae4716046/how_to_fix_a_snowblower_that_wont_start.pdf
    • https://uploads.strikinglycdn.com/files/11e8c7c9-d706-4872-a6cd-65059c377d12/vampire_diaries_season_1_episode_8_full_episode.pdf
    • https://uploads.strikinglycdn.com/files/46cc1bf1-4049-4a7b-9ed1-600ebb293621/what_is_the_best_summary_of_a_dream_deferred.pdf
    • https://de99c131-68bf-4271-bcef-cda292486844.filesusr.com/ugd/f5892c_10bc742e35e64e3da9fec2b4abe29e65.pdf?index=true
    • https://ac685e6e-6442-44c0-91a1-b3a367e79ef2.filesusr.com/ugd/ce77c6_786f98a98c9a46c78d5be6e0f9cc97e1.pdf?index=true
    • https://84d51d8d-5932-465a-b044-5d36dace581c.filesusr.com/ugd/98e2de_d63e7297dbbe430a97c89f711ae5cb1b.pdf?index=true
    • https://a4edf7fa-b057-49b5-8014-e5fd436fbef3.filesusr.com/ugd/c8b2c5_0330ad0a8daa48f39ce198ddb89724e1.pdf?index=true
    • https://uploads.strikinglycdn.com/files/987f63a2-6755-4320-a9e4-8e33b3d54efd/how_to_stack_a_maytag_washer_and_dryer.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef96.bin
11e2b9c2d56ff89ee22b60c115360fb1ee861ab7e386ce0fff03a0ca33b160b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF96 5656 bytes
font_01_sfnt_off000102e0.bin
42da0f73e4dbacf0083111a62ea263c8ffe405e908d06b4da992805e9f2ff21b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102E0 15936 bytes

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