Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a9336b5a4e43512…

MALICIOUS

PDF

80.8 KB Created: 2021-05-25 05:56:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 320cb42232ae3c411c5a75f546b697d2 SHA-1: 2c392d9a22f182c62d557e8e45e4003569f39e08 SHA-256: 0a9336b5a4e435129e21a4f97ce065d80b6b4f2376ac85c5231f152bb8ad0041
156 Risk Score

Malware Insights

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

The PDF contains a heuristic indicating a link farm and an embedded URL pointing to a suspicious domain. The document body, though heavily obfuscated, contains text related to search terms, suggesting a lure. The presence of multiple external links and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content.

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/strik?utm_term=shin+megami+tensei+game+boy+advance+rom+english PDF link annotation
    • https://gerutabelamulef.weebly.com/uploads/1/3/1/3/131384559/3818bc9078.pdfIn PDF document text
    • https://kenomipijisax.weebly.com/uploads/1/3/3/9/133986884/3decebcfe6.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/b8eedd45-537b-4cb0-b42b-6b745b5982c6/song_of_solomon_5_2_commentary.pdfIn PDF document text
    • https://s3.amazonaws.com/zasepo/endometrial_biopsy_interpretation_of_reports.pdfIn PDF document text
    • https://s3.amazonaws.com/jafujasiwetid/ccs_c_compiler_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/batoragubukepo/mapokawejuvafobotaxuwube.pdfIn PDF document text
    • https://s3.amazonaws.com/xiwevitox/metformin_hydrochloride_500_mg_tablet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84138dae-b43c-4f68-ac85-ffaee10c474d/tilaj.pdfIn PDF document text
    • https://s3.amazonaws.com/vobuturinivi/wesutikedajikejulefes.pdfIn PDF document text
    • https://s3.amazonaws.com/kujesulad/what_is_the_correct_order_to_watch_all_the_marvel_films.pdfIn PDF document text
    • https://s3.amazonaws.com/rekawexuretowo/wiwojox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9cf9f10a-5182-463c-b2ba-57ba32272889/63603947347.pdfIn PDF document text
    • https://s3.amazonaws.com/woneketelak/best_long_range_walkie_talkies_for_hunting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6323f5f8-2f15-4f3d-b2f4-2fdff89df7a9/62582679108.pdfIn PDF document text
    • https://s3.amazonaws.com/tevigotu/maxi_cosi_mico_ap_infant_head_insert.pdfIn PDF document text
    • https://s3.amazonaws.com/goveruduzewoxu/mr_christmas_outdoor_holiday_projector.pdfIn PDF document text
    • https://s3.amazonaws.com/tozaduliwubega/46199892351.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abaf7ba1-ce40-481b-97d4-490a602518af/how_to_use_a_lux_thermostat.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxagixil/970a-g46_bios_key.pdfIn PDF document text
    • https://s3.amazonaws.com/mesixadelomomo/streamlined_energy_and_carbon_reporting_regulations_2018.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E3 5760 bytes
SHA-256: 90a13efcb34fa28688e5aeff50c79deffa940ced2f69a1bec33c1fc0d3f3ae68
font_01_sfnt_off0000f85c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85C 11168 bytes
SHA-256: ef2dafef75d13c1555694976d0a84ddac42ff1e4b9d0abf3f537c80f129e056b
font_02_sfnt_off00011e71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E71 16092 bytes
SHA-256: e9fe716c2abc985b12a899a49d5539e4e8be1b56d50c083b30290d85a2a7c848

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