Malicious PDF — malware analysis report

Static analysis result for SHA-256 825a9d6603a90054…

MALICIOUS

PDF

73.0 KB Created: 2021-03-25 07:25:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 35e02c3e16933e601deb9645ef44e287 SHA-1: aebc98ccf4eb2b3bd08c54e88fd4bb1e8184735c SHA-256: 825a9d6603a900544e8e536081540d2ebcc3f2209a64b87451ece0502d500c35
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF document contains heuristics indicating it is a phishing lure, specifically prompting the user to install a browser extension or update. It also contains a high number of external links, suggesting a link farm or redirection mechanism. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://jacksth.ru/strik?utm_term=install+guide+wordpress+plugin
    • https://cdn-cms.f-static.net/uploads/4448720/normal_604d09f278d1f.pdf
    • https://cdn-cms.f-static.net/uploads/4405950/normal_601926f14bb19.pdf
    • https://cdn-cms.f-static.net/uploads/4383797/normal_6056bb9959621.pdf
    • https://xizuxikeg.weebly.com/uploads/1/3/0/7/130740292/64a28df3166.pdf
    • https://cdn-cms.f-static.net/uploads/4389090/normal_6042fbc9eb675.pdf
    • https://cdn-cms.f-static.net/uploads/4377380/normal_60327708ae345.pdf
    • https://gerugufudob.weebly.com/uploads/1/3/4/8/134869234/jumenireduxato-nudofevufaxab-vudedonukipew.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/078dcb74-ee78-4f2d-bfa0-26b1582f44e8/what_is_unity_definition.pdf
    • https://uploads.strikinglycdn.com/files/f8e0e6fd-bd93-4458-9787-ef14064daa2f/dream_interpretation_baby_feces.pdf
    • http://temomel.rf.gd/39220665567.pdf
    • http://zuretadi.rf.gd/51019966969.pdf
    • https://uploads.strikinglycdn.com/files/eaa378f3-9102-4ac9-a2b7-635b905f8693/anet_a6_firmware_original.pdf
    • http://zifunugol.epizy.com/60959276880.pdf
    • https://uploads.strikinglycdn.com/files/e8604314-4f62-43cc-a929-ba7b9a09f473/primary_succession_worksheet_answer_key.pdf
    • https://uploads.strikinglycdn.com/files/048549f1-f2c7-4a8c-b559-7a8391b58c6c/teruwulunilikuxifumusuka.pdf
    • http://mofebuxigonewo.epizy.com/79229841955.pdf
    • https://uploads.strikinglycdn.com/files/2471652e-66ee-4069-a6fa-c2bf605b8d56/toshiba_satellite_l750_ram_upgrade.pdf
    • https://uploads.strikinglycdn.com/files/98710fd0-2248-45cd-bc60-c13e478533b3/harry_potter_cast_snape.pdf
    • https://uploads.strikinglycdn.com/files/cd50e663-bdb7-4682-ba32-56ab4fb8826d/fl_studio_producer_edition_20.6.2_build_1549__patch_babupc.pdf
    • https://uploads.strikinglycdn.com/files/37d9f56b-de31-4725-bbfa-f45bcdf9cd17/31781490156.pdf
    • https://uploads.strikinglycdn.com/files/6a6656dc-54a7-4f13-b1b1-613c9f1fcb9e/kixarelukofajoxatomagu.pdf
    • https://uploads.strikinglycdn.com/files/32872a11-33d5-429f-8a08-e282eb4c497d/bissell_proheat_turbo_2x_troubleshooting_no_suction.pdf
    • https://uploads.strikinglycdn.com/files/4360b5db-47f2-4f56-8324-df8634e0a80f/29979851771.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_off0000e0cc.bin
e916a2e74f96cb52a4115273e729d08cfc863aae945e36fb40b041fffbc00ad2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CC 5156 bytes
font_01_sfnt_off0000f279.bin
21543bfa75d91773ca5710dbfe0739e852dec15eccd9063b764c812b92bb1b98		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF279 10524 bytes

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