Malicious PDF — malware analysis report

Static analysis result for SHA-256 c51751a8a82a9162…

MALICIOUS

PDF

75.7 KB Created: 2021-03-25 22:04:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 7ae9246dfd571ea3d1c5ec9d86f32723 SHA-1: 85bc4e80f600e683a395f913543652aa40532740 SHA-256: c51751a8a82a9162f989c29403b41ee33ae19c6dcae14cceb5c2f0a59ad86693
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 0.9997

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://xajibur.ru/award?keyword=automatic+control+systems+engineering+pdf PDF link annotation
    • https://mevinabepoke.weebly.com/uploads/1/3/2/7/132740553/47019a1b2c76.pdfIn PDF document text
    • https://vuzivofe.weebly.com/uploads/1/3/0/9/130969370/84ef3743.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388283/normal_5ff9eec91f877.pdfIn PDF document text
    • http://zugemenelil.medianewsonline.com/83969600165.pdfIn PDF document text
    • https://cdn.sqhk.co/potonefamuve/jbvif4d/my_walmart_money_card_routing_and_account_number.pdfIn PDF document text
    • https://cdn.sqhk.co/tipusuzog/fiemjhu/the_survival_hunter_games_2_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381085/normal_602b714ced458.pdfIn PDF document text
    • https://dunegigamirusa.weebly.com/uploads/1/3/1/4/131437715/8884f.pdfIn PDF document text
    • https://pudosibax.weebly.com/uploads/1/3/5/9/135964381/xapevopen.pdfIn PDF document text
    • https://cdn.sqhk.co/zukasedu/fdibVX3/photo_editor_pro_apk_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402504/normal_5fe59f5a9a4a0.pdfIn PDF document text
    • http://rajajime.mypressonline.com/67400094885.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365575/normal_601eb543cf498.pdfIn PDF document text
    • https://balejumefem.weebly.com/uploads/1/3/0/8/130814467/1409077.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/04e1ec39-735e-4623-9371-995a55e28f55/dupiwasawapureg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8140e03b-164c-4ce3-9937-3eba88dac8c1/39906085082.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48e02d4d-efa1-424e-9e84-ff5449182501/13074390866.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/019d79d2-26a1-4229-bd62-451ad629d98c/99638564264.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30680e52-9874-4a95-8741-01d7c6a44b38/45912675800.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50d4dd73-0b7d-458b-9d97-83da70234582/cuanto_equivale_6_pulgadas_en_milimetros.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ad488c3-a2a7-4d83-aca9-eb58b829e067/zuvumuvexumisajijiwexajed.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_off0000e77e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77E 5564 bytes
SHA-256: 72e154a822fcb03514677f37478ac3d1780aac2f48ef5c77f1bfde6297186c1e
font_01_sfnt_off0000fa59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA59 11484 bytes
SHA-256: 98a796fb8d5aa22f85148d042e94e631a71b3891dd97300964f8a444a5e9557f

Open this report in the interactive analyzer, or submit your own file for analysis.