Malicious PDF — malware analysis report

Static analysis result for SHA-256 248f545c72eff3ee…

MALICIOUS

PDF

71.0 KB Created: 2021-04-05 09:17:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 31f0129a9ddc8f217228eab22b4731d8 SHA-1: 398c47b454212e734700208137548eb80e0648db SHA-256: 248f545c72eff3ee6fb01dde337fc101d2830dcb20a5c4d97bcc98bf8a34a83d
134 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically pointing to 'dugedepap.ru/strik' which is indicative of a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URIs are consistent with a phishing lure designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dugedepap.ru/strik?utm_term=matlab+for+engineers+5th+edition+answers PDF link annotation
    • http://bit7.top/28661268403i1dqr.pdfIn PDF document text
    • http://copyright-central-media.com/balance_chemical_equations_worksheet_answer_key26f4z.pdfIn PDF document text
    • http://fitness1.space/703224137820me8z.pdfIn PDF document text
    • http://thailandlove.site/xalutozexirufexebuniguped2kqu3.pdfIn PDF document text
    • http://namedaun.fun/philips_bg3015_15_manualsnypy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4e33067b-0f13-4bed-bb9c-ea95f768fd7c.filesusr.com/ugd/23924c_d63897e2e7a548118744108d0338b9cd.pdf?index=trueIn PDF document text
    • https://1d942ef5-affb-47d8-8f99-70a3d187b733.filesusr.com/ugd/3283b0_989c77e5e84847848a1221b54f29b9e1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b2c047d-0dd3-47c7-bbcd-d3fab88113ea/mmpi-2_test_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/070c266f-9bb1-4efe-a3b1-ed8008d90510/how_to_write_good_copy_for_seo.pdfIn PDF document text
    • https://s3.amazonaws.com/dalava/fallout_shelter_quests_guide.pdfIn PDF document text
    • https://e25b7b56-d8f7-44cb-9276-56428e53d1cc.filesusr.com/ugd/63f3e8_eadd8ce5ab86426eb87f539ed5cb62bb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/patotale/1963_studebaker_gran_turismo_hawk_for_sale.pdfIn PDF document text
    • https://s3.amazonaws.com/liwafo/how_to_pronounce_chakravarty.pdfIn PDF document text
    • https://41fe7446-7195-45c8-906d-de5e784989f9.filesusr.com/ugd/e02969_897bd3bf556041fb87e9979c1092c053.pdf?index=trueIn PDF document text
    • https://e6c529cc-411f-4195-b5ea-7b5fd081490a.filesusr.com/ugd/b7ab08_f77b67b2d76b4566a882144d57791c15.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ropuba/what_is_the_best_espresso_machine_for_home_use.pdfIn PDF document text
    • https://4cd5a77a-be8d-44ba-8952-4177873115c4.filesusr.com/ugd/930050_939cdaf50f1e41f0adc7d98b76910059.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/383536af-edfd-4cea-a0dd-7bfed7c87f71/zunipexider.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26e45781-964f-43b8-938a-158e48420ee2/57533660777.pdfIn PDF document text
    • https://s3.amazonaws.com/mogipegi/tazemimuzisoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d153239-dbfd-4041-8ddd-23d8d4fc999f/nexobomigororijaj.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_off0000d795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD795 5528 bytes
SHA-256: 3f1bb95dbee8ac49f5f429a14a85297b83cd6b80ed53b4c649218edf023e07d8
font_01_sfnt_off0000ea77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA77 10596 bytes
SHA-256: ef50d1c31fec92dd96fdd6768d564a05c87a6c79c452f4e358e0a865594769b5