Malicious PDF — malware analysis report

Static analysis result for SHA-256 d45f5bdd36eb637e…

MALICIOUS

PDF

89.1 KB Created: 2021-04-07 00:14:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 17ae044542dde60f540f3fb4491c96b8 SHA-1: 590fa946ad6d36c7677e872dedebe76883b73203 SHA-256: d45f5bdd36eb637ec8fcd8bf759548344cc5d7ef574d338741129dc0345073bf
186 Risk Score

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 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/award?keyword=phylum+arthropoda+characteristics+pdf PDF link annotation
    • http://doxedisipi.scienceontheweb.net/gefibilibemobezodoxad.pdfIn PDF document text
    • http://dujojiwasemob.mywebcommunity.org/24_rules_of_subject_verb_agreement.pdfIn PDF document text
    • http://xumavedam.22web.org/metole.pdfIn PDF document text
    • https://dodafawo.weebly.com/uploads/1/3/4/6/134698388/mikolawuku.pdfIn PDF document text
    • https://litapofigiwo.weebly.com/uploads/1/3/5/3/135349015/7421014.pdfIn PDF document text
    • http://tavegumata.sportsontheweb.net/career_paths_electrician_express_publishing.pdfIn PDF document text
    • http://bosaboro.22web.org/regional_sales_manager_job_description.pdfIn PDF document text
    • http://pibosezegis.22web.org/doragerosagana.pdfIn PDF document text
    • http://kigazuvunawolux.iblogger.org/37120452108.pdfIn PDF document text
    • http://borulozakul.22web.org/google_adwords_fundamentals.pdfIn PDF document text
    • https://xafinuwexedigu.weebly.com/uploads/1/3/1/3/131379324/61580.pdfIn PDF document text
    • http://borejukeluteva.mygamesonline.org/tulisek.pdfIn PDF document text
    • http://rilomenininun.getenjoyment.net/pewuxoxuwivadusavel.pdfIn PDF document text
    • https://kesuwevibumeju.weebly.com/uploads/1/3/0/8/130814845/ea126f66e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/farowug/aviation_navigation_apps_for_android.pdfIn PDF document text
    • https://68e1e3d4-268d-49bc-a8aa-b119cb10fea7.filesusr.com/ugd/3ceeb9_d94d0d43a0a643d4918ca459bddc28e8.pdf?index=trueIn PDF document text
    • https://891dfe3a-8969-4df2-b253-5ccc4ebbb7a0.filesusr.com/ugd/e66789_55c1eee14cb04c4eb32e8e8a43a8fe02.pdf?index=trueIn PDF document text
    • https://3ae4d138-4ba3-4962-98fb-1b98b40a6a82.filesusr.com/ugd/38062a_319e61a4bc0c47cebf0a1e7f39029f45.pdf?index=trueIn PDF document text
    • http://vubebolideb.rf.gd/bio_data_form_file.pdfIn PDF document text
    • http://rufedum.rf.gd/hybridization_biology.pdfIn PDF document text
    • https://s3.amazonaws.com/tokatefozude/71756570503.pdfIn PDF document text
    • https://s3.amazonaws.com/libosokune/savulaz.pdfIn PDF document text
    • https://05491ccc-77c7-428b-9c25-74f2c6c50d4a.filesusr.com/ugd/d51d36_0183ed8e3001419db1e84dd7e274cd95.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gurupixabogivaz/accident_report_bend_oregon.pdfIn PDF document text
    • https://6323cc82-cf72-43ae-bc7a-f8d691a1d37e.filesusr.com/ugd/4f3578_e8159fa261cd4056b983bc7ec903aeb0.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_off00011e42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E42 5496 bytes
SHA-256: f700840163f8ca713a2d5b1c16c7f0699b29a5f03d88ea3b60baf308d613f94b
font_01_sfnt_off000130ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130CE 11476 bytes
SHA-256: 1ac66429fc6310d4eb19ecb2a369ff3f8f695be162a5067026c5b890050dd63a