Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba56d756f9a97582…

MALICIOUS

PDF

72.6 KB Created: 2021-03-31 05:22:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 6a663375639b3685796b165fb73986eb SHA-1: ed86a1aa18eb5ae935cb2c4088577361489dfcf9 SHA-256: ba56d756f9a97582f003d1d04f48b66efce3e3445b79138186d223dca9c21067
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It contains a large number of external links, suggesting a link farm or phishing attempt. The document body, though heavily obfuscated, appears to be related to search terms, reinforcing the lure. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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://resalured.ru/award?keyword=pneumatic+valves+symbols+pdf PDF link annotation
    • http://bigpleasure.ru/armored_car_285vm0nk.pdfIn PDF document text
    • https://lidonamu.weebly.com/uploads/1/3/4/7/134722791/3311053.pdfIn PDF document text
    • https://sezitekiporav.weebly.com/uploads/1/3/4/6/134627959/suwefi.pdfIn PDF document text
    • http://noverst.xyz/ridgid_12_gallon_shop_vac_hosefiyco.pdfIn PDF document text
    • http://youralteragoods.com/bose_qc15_ear_cushion_kitlpqs0.pdfIn PDF document text
    • http://1xbet-football.fun/8510226807836hzh.pdfIn PDF document text
    • http://magnifioco.site/environment_and_you_christensenf4znr.pdfIn PDF document text
    • https://rukinedofixod.weebly.com/uploads/1/3/4/3/134348838/8746711.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/wejuvono/walazimovizupazalexe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddd459cb-dfb1-474f-94b0-cca8659285de/65295472725.pdfIn PDF document text
    • https://s3.amazonaws.com/gixawetopoli/hyperbolic_cooling_tower_design.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c420ada8-b4b9-41b3-9368-301d06b90c5c/how_do_i_reset_my_directv_remote_to_a_new_tv.pdfIn PDF document text
    • https://s3.amazonaws.com/pululusodogi/94120403778.pdfIn PDF document text
    • https://s3.amazonaws.com/xoxaneral/1137795896.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e61d9f8-9f12-4b02-891a-4b7207144651/sowan.pdfIn PDF document text
    • https://s3.amazonaws.com/novifamigot/sepujawimorefolemotulig.pdfIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/batman_dark_knight_rises_apk_data_revdl.pdfIn PDF document text
    • https://s3.amazonaws.com/fewunadupop/free_printable_jungle_animals_coloring_sheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb230215-6497-431e-a528-6269fe5a2a3c/83195938600.pdfIn PDF document text
    • https://s3.amazonaws.com/vufupu/64999929466.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_off0000dc3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3D 5508 bytes
SHA-256: f50f232c07f4f5ee44035151b063551d04dcfbe5427e33e9e41c3869468383a3
font_01_sfnt_off0000eef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF2 10792 bytes
SHA-256: f798f82b9d98289f4adee55a93d40f77b30681f053dcf6dab924fcd8fdc16d15

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