Malicious PDF — malware analysis report

Static analysis result for SHA-256 635e30218f79d043…

MALICIOUS

PDF

79.8 KB Created: 2021-03-25 22:05:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 01f7ad313fe17668fc7c096f75471ec4 SHA-1: e98087a7f18374d8ce6575734a0e785749460e9b SHA-256: 635e30218f79d04345a2d8c3f9a78b2aab93d5b096195137be082dd3231c859d
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are SEO-optimized, suggesting a link farm or phishing attempt. The primary external URL points to a site that appears to be related to thermal camera prices, but the overall structure and ClamAV detection indicate a phishing or malicious intent. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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-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=flir+c2+thermal+camera+price
    • https://cdn-cms.f-static.net/uploads/4476952/normal_60381f2d06ceb.pdf
    • https://cdn-cms.f-static.net/uploads/4412606/normal_6019f4b37c098.pdf
    • https://cdn-cms.f-static.net/uploads/4444853/normal_6045021abb8d6.pdf
    • https://cdn.sqhk.co/mosugukasiba/pW5FghB/uae_exchange_online_transfer_customer_care.pdf
    • https://cdn.sqhk.co/mibajufaneja/6hejaUP/lafisulurufurezi.pdf
    • https://visofebofoxofub.weebly.com/uploads/1/3/0/8/130814652/runiruwujesixavida.pdf
    • https://fowexukemaxoz.weebly.com/uploads/1/3/4/3/134369940/rutimovewovose.pdf
    • https://cdn-cms.f-static.net/uploads/4450427/normal_6044ff8e0f2b9.pdf
    • https://pakokapixufepu.weebly.com/uploads/1/3/4/6/134659136/79b42b1ca5.pdf
    • https://sesenadudukani.weebly.com/uploads/1/3/0/7/130739889/5426127.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://7e079b21-6cfc-4bbc-a8af-001f4930a7f2.filesusr.com/ugd/f66805_8f431e59e2ab4c74b6d274ae2003d97f.pdf?index=true
    • https://3e1af3dc-cf37-4f58-935d-0a6065bc5ce9.filesusr.com/ugd/3ca236_1a20637830ac47e282a0e310d8260da4.pdf?index=true
    • https://s3.amazonaws.com/benubapopikaj/golf_buddy_voice_2_battery_life.pdf
    • https://s3.amazonaws.com/xedewofuretujo/cinema_amman_padal.pdf
    • https://s3.amazonaws.com/gotitibekovi/bovexaxefaluxebesibuxe.pdf
    • https://s3.amazonaws.com/makumapikeze/overlord_vol._9_light_novel_the_caster_of_destruction.pdf
    • https://s3.amazonaws.com/benubapopikaj/8884736324.pdf
    • https://s3.amazonaws.com/poguvelefa/dolegaki.pdf
    • https://2ddc7431-ff91-46e9-9708-195efd6cc195.filesusr.com/ugd/ffe0d3_2aa702c44b54460abaef6a675a07c956.pdf?index=true
    • https://s3.amazonaws.com/webipejonavuv/free_indesign_cover_letter_template.pdf
    • https://s3.amazonaws.com/suxuzubojut/tuch_durga_tu_bhavani_marathi_song.pdf
    • https://810dce77-56ab-4324-823a-3549757f4eab.filesusr.com/ugd/1fad07_99a7349b365d47fc914c5579306845a4.pdf?index=true
    • https://4f65501f-cdae-4966-b9db-49b15ad9d196.filesusr.com/ugd/52b593_8134e4748b804638834d20ff5bfcc9fa.pdf?index=true
    • 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_off0000fb23.bin
8ee550b7b7b3a8e3c77a859eac42c3fc8908811aeb347a52b8315c96fab4be41		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB23 5084 bytes
font_01_sfnt_off00010c42.bin
2281692b2fc733273d5a8591f4955397b5714794bb16a1d3a03e0ed96e469474		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C42 11104 bytes

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