Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8be701e6d4f628b…

MALICIOUS

PDF

73.6 KB Created: 2021-04-02 13:41:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b56528bc38658aa4c30c01da3e950fd6 SHA-1: d9fc95b193b752497f81ad17bb94de16b472d957 SHA-256: d8be701e6d4f628b5c830c929935ba802ff5730cdf8f646b17cf77f2c4c650ef
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, suggesting a malicious intent to manipulate search engine results or redirect users to potentially harmful sites. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the presence of numerous external URLs and the PDF_SEO_LINK_FARM heuristic indicate a phishing or content distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://botokaw.ru/wix?keyword=non+cdl+hotshot+jobs+in+texas
    • http://floradoma.net/how_to_draw_easy_halloween_thingsli296.pdf
    • https://cdn.sqhk.co/niserutom/GEgdoge/libil.pdf
    • https://cdn.sqhk.co/zazifutunoj/5IBhigd/starcraft_autumn_ridge_180bhs_for_sale.pdf
    • https://cdn.sqhk.co/demexadol/680QJwL/47111336444.pdf
    • https://cdn.sqhk.co/noxobabidof/RUh9q7h/impulse_response_matlab_system_identification.pdf
    • https://cdn.sqhk.co/nejajevafode/ghc5jex/scp_096_vs_scp_173_mod_apk.pdf
    • https://cdn.sqhk.co/naritiba/yCxhcii/49084304892.pdf
    • https://cdn.sqhk.co/linidivez/aTihrib/the_freebie_2010_full_movie_online.pdf
    • https://cdn.sqhk.co/sixitigoxeto/jhidfie/the_ghost_killer_2011_full_movie.pdf
    • http://changepass.online/how_much_does_a_50_hp_outboard_weight5qbrl.pdf
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdf
    • http://helper-badges.com/wamewewunosaninizzz3mq.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/070c100a-7bdb-448f-a2e2-10ba048d3980/jalin.pdf
    • https://044ec7df-721b-4788-b209-87474a3fcb06.filesusr.com/ugd/60ffa2_af51ca2f04a14750bff77df0140faf99.pdf?index=true
    • https://94e55d9a-ad7c-4b6b-a54a-a00202ad3087.filesusr.com/ugd/208fd7_6fb999f002e7457cbd2a17ffc0a3bdc6.pdf?index=true
    • https://711a90e7-97f2-4eab-8690-3003ec1e9b64.filesusr.com/ugd/a0905b_4eeef5c7edc84dd090751d24efc20c15.pdf?index=true
    • https://90ff81fc-98d9-4e53-96a3-aaa5c1c2042e.filesusr.com/ugd/bb5aff_518a159b234449388ab6ba1d971ef74f.pdf?index=true
    • https://b18ac5c8-c825-4c59-a0a1-290c879ce4f6.filesusr.com/ugd/1a0fde_2d0b200a4d86475fbbfcd6db95e6809c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/cac1020e-7d59-42b7-a4b0-cead36b40795/73998598211.pdf
    • https://uploads.strikinglycdn.com/files/aa3354b2-bf6d-406c-ac96-a3130f0c5027/mefivamo.pdf
    • https://uploads.strikinglycdn.com/files/5017a249-addf-4334-9226-00f215489bb3/what_is_the_difference_between_weber_genesis_ii_and_spirit_ii.pdf
    • https://ccd4a2e6-63e2-4dcb-a02e-1ae1253dabcc.filesusr.com/ugd/059ff1_c632281f9e664aaeae1db340ad945f71.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8ad72eb5-086b-4216-8e57-d83f25d0a156/vox_ac15_price_philippines.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d544.bin
87dfbb66b09e6c193ebca01c2192394ea962cb552d9e818c4103500da87abd16		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD544 4972 bytes
font_01_sfnt_off0000e622.bin
dcbe3eecf1ffc42e42124ef35edf2f08dadbcf8c8211338ea40f22d7083f9d31		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE622 10592 bytes
font_02_sfnt_off00010a76.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A76 4324 bytes

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