Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd49ebacc83fd26a…

MALICIOUS

PDF

77.0 KB Created: 2021-03-11 08:15:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 47a9c068cdfe966c225738b9a50b8ef3 SHA-1: df191c18dcd54687b8a880a06fc15e5516789b3b SHA-256: bd49ebacc83fd26a6c802341b92bf58a34f734cfae05d4b02e7ea5feecfd72f5
156 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a "Pdf.Phishing.Trojan". The document contains a large number of external links, suggesting a link farm or redirection to malicious content. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate an attempt to manipulate search results or distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://golowaki.ru/award?keyword=paises+y+sus+capitales+del+mundo+pdf
    • http://tokexal.medianewsonline.com/how_to_build_a_100_day_plan.pdf
    • https://cdn-cms.f-static.net/uploads/4384820/normal_5fd644a406784.pdf
    • http://dapajurop.mygamesonline.org/are_greek_and_hebrew_the_same.pdf
    • https://cdn-cms.f-static.net/uploads/4410448/normal_60239ae5660ec.pdf
    • http://xasowokudat.medianewsonline.com/45079274045.pdf
    • https://cdn-cms.f-static.net/uploads/4413465/normal_60346f8cae30e.pdf
    • http://vizexibidoxi.getenjoyment.net/16552946191.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://ratobewiwigu.atwebpages.com/average_salary_of_a_microbiologist_uk.pdf
    • https://uploads.strikinglycdn.com/files/5f5fe83b-8f09-4940-a449-26c936d3002c/30435916476.pdf
    • https://uploads.strikinglycdn.com/files/ec97ab33-1045-41ea-acbb-2f750dad8483/garmin_astro_320_manual_en_espaol.pdf
    • http://namepafubi.atwebpages.com/schwinn_bicycle_pump_parts.pdf
    • https://uploads.strikinglycdn.com/files/701e175e-8a10-4089-b9d2-f78f4c7debdb/cuando_se_tiene_que_sacar_la_muela_del_juicio.pdf
    • https://uploads.strikinglycdn.com/files/dbd06af5-31c6-42d2-9b43-c62709811347/xenimajevamixo.pdf
    • https://uploads.strikinglycdn.com/files/5753d8c0-225f-492e-b1a0-fb996f31e0fa/80943913625.pdf
    • https://6a24fdd2-d4a5-4c4b-882b-0f3115751bcf.filesusr.com/ugd/04e6f9_eba873c236ae43aa8399e12e1e923a93.pdf?index=true
    • https://5548a280-a194-4776-8019-0e256783c1fa.filesusr.com/ugd/f2c1dc_497ae13967124febbe517841495107c0.pdf?index=true
    • https://uploads.strikinglycdn.com/files/fffb5332-3f92-47e5-a6c0-c97357e35fc4/fuvosipub.pdf
    • https://uploads.strikinglycdn.com/files/a9c22a26-5828-48f7-8e7a-96bc537a2b5a/what_is_the_software_development_life_cycle_model.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_off0000eeb4.bin
e27487ce751e6acdc4bffcf7edf3967268db120d95417847922de81c3e7f24e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB4 5308 bytes
font_01_sfnt_off000100c2.bin
77dd5bd93d08c2968869caccb366ce75a167216106586aa561b2bd111334add6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100C2 11060 bytes

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