Malicious PDF — malware analysis report

Static analysis result for SHA-256 02274a02378fa57f…

MALICIOUS

PDF

74.5 KB Created: 2021-04-08 02:43:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 45df0a1ee292df496f0473b92e9b80fa SHA-1: 99ae1738cc507db034a2a4345a296331ab1d43b6 SHA-256: 02274a02378fa57fbff081f75117a4c01d3d2515395f5fc4903e2f7e957ec287
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://leonvi.ru/strik?utm_term=how+to+use+weka+tool+for+prediction PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380213/normal_603cff3cba841.pdfIn PDF document text
    • https://vamemaxodoj.weebly.com/uploads/1/3/1/4/131437173/lepitezutebesis-xaforalifi-ramoweronukolo.pdfIn PDF document text
    • http://ideal-it.fun/fidoxisibaridadamimu1r64q.pdfIn PDF document text
    • http://efarbok.xyz/gezowejiwowuxeluf9rmpv.pdfIn PDF document text
    • http://aduo5.online/pisuxewusm2nh9.pdfIn PDF document text
    • https://ripukalogud.weebly.com/uploads/1/3/4/3/134391837/7f51fcc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393911/normal_605ade04a63f5.pdfIn PDF document text
    • https://zitifulopesere.weebly.com/uploads/1/3/4/7/134722705/tuwujad.pdfIn PDF document text
    • http://siwupezomejen.getenjoyment.net/rafajimefemilonibesu.pdfIn PDF document text
    • http://vatidenow.medianewsonline.com/how_long_to_learn_music_theory.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://madigekole.onlinewebshop.net/etiologia_de_la_diabetes_tipo_2.pdfIn PDF document text
    • https://b9e1b105-38e0-4bbf-baad-90de1e2021e1.filesusr.com/ugd/432b07_b0e6ccc4d17e4ee4beeb9cea4d947863.pdf?index=trueIn PDF document text
    • http://rususekobijo.myartsonline.com/birla_sun_life_mutual_fund_common_application_form.pdfIn PDF document text
    • http://nuvufitimasex.epizy.com/ielts_speaking_part_1_vocabulary.pdfIn PDF document text
    • https://d21da297-2d1c-4020-882f-059d99c29dc9.filesusr.com/ugd/3724a2_c12ca27daf8941ba94b1bbffaee1dc21.pdf?index=trueIn PDF document text
    • http://xegefonupekowa.epizy.com/fekiferedegugoxigezapa.pdfIn PDF document text
    • https://4a0f17ac-6ce6-4c05-9546-25c48d39d9f7.filesusr.com/ugd/cd79e3_a4b145a346a6495db0f8deb4cf1025bb.pdf?index=trueIn PDF document text
    • https://b0c090b1-cb02-46d8-8a69-3fb9d82636b6.filesusr.com/ugd/4dbf3f_76c8d0ff1921435393d74bbdb4d32531.pdf?index=trueIn PDF document text
    • http://mafujegimeti.rf.gd/origin_of_atmosphere.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_off0000e2f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F8 5268 bytes
SHA-256: d0cd636b09eddb96d13ae087b1b7e952876520c8bb798f632b40ae79f51c1646
font_01_sfnt_off0000f507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF507 11276 bytes
SHA-256: 8f8e4448e4610f14f1453f484f62c189a57cafda071da018686eea3aa43a4dd1

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