Malicious PDF — malware analysis report

Static analysis result for SHA-256 99ce306bb0fc44da…

MALICIOUS

PDF

72.3 KB Created: 2021-04-01 14:58:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: d577ae61f7651400a16aa8680e7f797a SHA-1: afcc70c6adec00365dea3abc08b595b3eb558367 SHA-256: 99ce306bb0fc44dafa000414fe0a32259a2a9f293d8ce1d47fb9600e4a00b216
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDFs, suggesting a link farm or SEO poisoning attempt. The primary malicious URL identified is https://nipisod.ru/strik, which is likely used to redirect users to a phishing or scam page. The ML classifier and ClamAV detection strongly indicate malicious intent.

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 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.
  • 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://nipisod.ru/strik?utm_term=how+many+red+cards+are+in+a+standard+deck+of+cards PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4488581/normal_603411bc6e3d3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460682/normal_5fcb5598d58b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477892/normal_6009bb318648d.pdfIn PDF document text
    • https://gimalijuvilonur.weebly.com/uploads/1/3/4/6/134619020/roroneniwos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450625/normal_603423f52e8a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425209/normal_5fd3b2649f5c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480579/normal_601ccdbe3d44d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384037/normal_601af6ebd6f0a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427267/normal_60288e39eea12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420432/normal_601ece06f116a.pdfIn PDF document text
    • https://magazeja.weebly.com/uploads/1/3/5/9/135990405/zoduvutikiwava.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/475c9744-673b-4cd2-906d-57c2bed51436/75930339999.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df068e3a-f47f-48f8-a238-1b6bda0484f1/sas_ods_csv_multiple_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/lomuper/candy_crush_saga_game_app_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47040f8e-ec4b-4e4e-b445-9b32f8af5841/is_a_simple_favour_available_on_netflix.pdfIn PDF document text
    • https://s3.amazonaws.com/gofilafixu/how_to_use_sunbeam_humidifier_swm6000.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50ac9916-2e32-4510-a47b-c300cd8056c0/57476779699.pdfIn PDF document text
    • https://s3.amazonaws.com/gupawupigawono/kufigigitabavej.pdfIn PDF document text
    • https://s3.amazonaws.com/vovopafubipu/sherlock_holmes_a_game_of_shadows_full_movie_download_dual_audio_hd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37d37fd9-2425-4977-89ad-917e07ffe36b/51018793007.pdfIn PDF document text
    • https://s3.amazonaws.com/lizuseguwix/14844737196.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_off0000de24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE24 5356 bytes
SHA-256: 769d78383b62c6032e56fd76c368bd4916f277d30b7b6f004bca0bd4ba713556
font_01_sfnt_off0000f059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF059 10376 bytes
SHA-256: 818f2ef3d4f2e67bfed5fefaa839a9e4def2ab16eb3a77763feb8608357d3c02

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