Malicious PDF — malware analysis report

Static analysis result for SHA-256 a97d9beb3648fde4…

MALICIOUS

PDF

76.9 KB Created: 2021-03-19 06:02:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: a46043ed540250055d1eff94e6be5b4b SHA-1: 22ea14981bddccb0dd43aaec6f53ddf30c1d65da SHA-256: a97d9beb3648fde48c1e706a6e43b96f3ce8ab55796b512584f47c145afb8b5e
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous external links, with a critical heuristic identifying a link farm, suggesting a phishing or SEO spam campaign. The document body, though heavily obfuscated, contains keywords related to business requests, aligning with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://fokemale.ru/award?keyword=business+partnership+request+letter+sample+pdf PDF link annotation
    • https://wasatetokis.weebly.com/uploads/1/3/4/5/134513062/2362412.pdfIn PDF document text
    • https://dekoluzoben.weebly.com/uploads/1/3/4/4/134472937/bedemijeroluwuf.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/b0acda77-a179-468b-9b2a-dd022ad616a5/vusisewukenux.pdfIn PDF document text
    • https://s3.amazonaws.com/nuruvapozixix/94075978684.pdfIn PDF document text
    • https://d2d87fd5-5f4d-49aa-ab3c-2263ce4b5d22.filesusr.com/ugd/9169d2_c6c108268369481bb192b119be2fd6ad.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fikuvine/fejubo.pdfIn PDF document text
    • https://cf176ec6-4820-456b-adf9-61e5f06c968f.filesusr.com/ugd/43d598_dac6c1e4b3e0471e8fac61f6088b4366.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1298a580-3c6d-4bae-940e-6a5e28b59fef/pioneer_sph_da120_wiring_diagram.pdfIn PDF document text
    • https://0491f86b-060d-4f4a-be23-b0d01488777f.filesusr.com/ugd/faa7ef_799675d8b6ec43338277892d80e4bfc7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pibabopuduj/buy_black_anodized_aluminum_sheet.pdfIn PDF document text
    • https://3745348a-78a0-42d7-8ff4-af2b45bf5faf.filesusr.com/ugd/02631b_ddc830a29daa46c09f896241d6850e48.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/davawina/43205830984.pdfIn PDF document text
    • https://57eba762-b826-4879-8d7a-7f480aba2934.filesusr.com/ugd/e89c2b_084f15d8ec9c49e985a5482f8a3e0626.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5a0199a-6388-4746-ab8f-6116b96881c8/sony_a6500_weight_with_kit_lens.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af2d5adf-5143-4c3c-b9b5-0ff7a14ed0e9/magic_bullet_replacement_parts_walmart.pdfIn PDF document text
    • https://s3.amazonaws.com/wemupajese/xusulilenorilolikof.pdfIn PDF document text
    • https://s3.amazonaws.com/fadadedezeker/rupanawat.pdfIn PDF document text
    • https://s3.amazonaws.com/fopalew/relapse_prevention_plan_template_eating_disorder.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_off0000ef00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF00 5456 bytes
SHA-256: 90c09ab9caffa241889e02b17d5d8a58df94504f318d21741c172ece778c9f23
font_01_sfnt_off00010163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10163 10768 bytes
SHA-256: 68c55205d575abbf2d8163aa828e27fb606d6c0ceca3660b6a4d276d43f885aa

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