Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a2f3d15575e8268…

MALICIOUS

PDF

65.7 KB Created: 2021-05-14 14:58:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 0197e9b2262f09b6a97a69b2dffdb617 SHA-1: eb7defb6598d2cc7a4b7834e6d7c308a0cb0402b SHA-256: 4a2f3d15575e82686ca3d9ad999975fba72e4139758a605cb8b9d7583334a567
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9997

Heuristics 5

  • 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 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://botokaw.ru/strik?utm_term=the+very+busy+spider+sequencing+worksheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413370/normal_6025baf2a29c8.pdfIn PDF document text
    • https://rurinigumiza.weebly.com/uploads/1/3/5/3/135350695/jovibizojanemawe.pdfIn PDF document text
    • http://tofoxewesaxizuz.mywebcommunity.org/77806136592.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368996/normal_6064d0934baff.pdfIn PDF document text
    • https://wezunemoxojo.weebly.com/uploads/1/3/5/3/135321606/4705353.pdfIn PDF document text
    • http://suporefebakibur.mygamesonline.org/dinike.pdfIn PDF document text
    • http://lamejix.scienceontheweb.net/analytical_methods_in_supramolecular_chemistry.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446491/normal_5ff53f6e980d5.pdfIn PDF document text
    • https://guwuviwanawa.weebly.com/uploads/1/3/2/6/132695801/namesi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480895/normal_601745a10d560.pdfIn PDF document text
    • http://mif-smeh.space/is_inkheart_a_real_bookm9j4l.pdfIn PDF document text
    • http://dragonflysagewellness.com/wusotepejomexamog3ld3z.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408987/normal_5fd36cffaf13a.pdfIn PDF document text
    • http://trackengine.host/is_hbo_max_on_roku_nowc493w.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://48936d5e-4b15-4059-a328-ddb12afcc15e.filesusr.com/ugd/173145_a5128fade0e94d08998e614b1d23f192.pdf?index=trueIn PDF document text
    • http://safedoguno.onlinewebshop.net/20717984377.pdfIn PDF document text
    • https://a763ebd9-c18e-43e0-89ad-bff0d4d40701.filesusr.com/ugd/2e16aa_15d49040fb4c4cb6a19867cae08267c0.pdf?index=trueIn PDF document text
    • https://43cb2d18-1589-43a7-b1c5-fe1278e1c76d.filesusr.com/ugd/370b54_57ec03bc06554915a3b68843f23d80da.pdf?index=trueIn PDF document text
    • http://nowimirozox.atwebpages.com/imprimir_para_nios_tablas_de_multiplicar_del_1_al_12.pdfIn PDF document text
    • https://9e4d96d7-92f1-4145-9aac-d1976e75dfe6.filesusr.com/ugd/49a98b_5bcdae21734a42d5972c616b45f17826.pdf?index=trueIn PDF document text
    • https://d62ff7d9-aefc-4ab8-8cdf-af38868aea16.filesusr.com/ugd/54b9a1_36fa9a4fce9e48c284415bf3a4905027.pdf?index=trueIn 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_off0000c41b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC41B 5624 bytes
SHA-256: 533356838306797edb99a4969474ae962b6f6cd560f3a370e0e127ca9f8c50ff
font_01_sfnt_off0000d74b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74B 10108 bytes
SHA-256: 89609fe3bd66984097fa54e3573737496bc63a343496c075f346ad85c5a2675b

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