Malicious PDF — malware analysis report

Static analysis result for SHA-256 7105b81d30dc1911…

MALICIOUS

PDF

71.3 KB Created: 2021-03-20 19:51:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4fa23a156c169bcfece91b0f260e4216 SHA-1: 1b1b6c9e9f1acb6e2b3cfc7195a81ed36a76b785 SHA-256: 7105b81d30dc1911879ab9f6a81b5cdb6fe288d58619777de2e3e5ab88ac9590
96 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious content. It contains an embedded URL leading to a suspicious domain, likely intended for phishing or malware distribution. The document body, though heavily obfuscated, suggests a lure related to 'Aprilaire thermostat instructions', aiming to trick users into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kuzutuzo.ru/aws?utm_term=aprilaire+thermostat+instructions
    • https://cdn-cms.f-static.net/uploads/4406170/normal_604de57f8c929.pdf
    • https://static.s123-cdn-static.com/uploads/4476270/normal_5fdf82be28c1e.pdf
    • https://cdn-cms.f-static.net/uploads/4407301/normal_604d263ce6f9c.pdf
    • https://cdn-cms.f-static.net/uploads/4372980/normal_603a421b62938.pdf
    • https://cdn-cms.f-static.net/uploads/4447647/normal_604d1325a27d1.pdf
    • https://cdn-cms.f-static.net/uploads/4416305/normal_60379a7f4eb65.pdf
    • http://ziwegiwe.iblogger.org/workmanship_warranty_letter_template.pdf
    • https://static.s123-cdn-static.com/uploads/4494146/normal_6005aca0e8941.pdf
    • https://cdn-cms.f-static.net/uploads/4458623/normal_602f265704f16.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/51d45c1b-4f39-4e71-be8c-debd2f2638b5/lee_precision_modern_reloading_2nd_edition.pdf
    • https://uploads.strikinglycdn.com/files/5d5a24b8-74af-413b-8ac5-13e56caf62a4/xumorufanomemarefadofuti.pdf
    • https://uploads.strikinglycdn.com/files/2fc0e979-fc87-436c-95c0-19e07c5cbf21/ruud_water_heater_troubleshooting_codes.pdf
    • https://uploads.strikinglycdn.com/files/f7665f9b-b988-477b-9dee-63e29de3b20c/glock_19_gen_4_accessories_laser.pdf
    • http://xolemobubusosi.rf.gd/brightsign_player_video_formats.pdf
    • https://uploads.strikinglycdn.com/files/c8b14d9d-7b36-43e4-879f-d7ef3ef4693a/koxiwof.pdf
    • https://uploads.strikinglycdn.com/files/ae298e2b-1a03-4eb0-a1e8-c92952ec2481/active_and_passive_voice_slideshare.pdf
    • https://uploads.strikinglycdn.com/files/bb189e87-58e1-49b4-950f-02db4b522f37/gimp_vs_photoshop_which_is_better.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d70a.bin
b287718adb03e11a6cec12860ac3eb9e961cb7648fabbb4fc9afbebe9b191a67
pdf-font-stream PDF embedded font (sfnt) at offset 0xD70A 5164 bytes
font_01_sfnt_off0000e868.bin
a71406c3263d609d252c591e365029c939f623ca388fe395b757711c373f562f
pdf-font-stream PDF embedded font (sfnt) at offset 0xE868 11620 bytes