Malicious PDF — malware analysis report

Static analysis result for SHA-256 f35d30b05378c760…

MALICIOUS

PDF

91.5 KB Created: 2021-03-04 15:28:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9f6bc9f0bb6bf869f6b63f6fb9c264c7 SHA-1: 421fb93c54c4586cf8adb34727d8f5f9ed4492e4 SHA-256: f35d30b05378c76075bde65ef0186e84fa655eb34d12c6f51c4457fca0c6544d
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a significant heuristic firing indicating a 'PDF_SEO_LINK_FARM' that points to 30 external PDF files. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as a phishing or trojan. The document body, though heavily obfuscated, contains text related to an 'organic chemistry 2 final exam cheat sheet', which serves as a lure to disguise the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/123?utm_term=organic+chemistry+2+final+exam+cheat+sheet
    • http://dream-stat.ru/arcade_belts_reviewgn4ep.pdf
    • http://soinjaga.ru/scout_tenderfoot_requirementst8y9p.pdf
    • http://forajadafogaxuv.medianewsonline.com/71039969797.pdf
    • http://8bitbeardsco.com/jazitakuvuxabo2qfpk.pdf
    • http://itsnat.space/how_to_get_a_duplicate_drivers_license_in_mississippinvld8.pdf
    • https://cdn.sqhk.co/fotajoge/jRzjgFw/push_payment_fraud.pdf
    • http://nicechange.space/panasonic_plasma_tv_hdmi_2_not_workingvkxdv.pdf
    • http://rat-red.space/financial_feasibility_report_meaningsav84.pdf
    • https://cdn.sqhk.co/juzurupivepo/hdrd6in/40375501618.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://b615eccc-4413-4b1d-8109-ede925130a83.filesusr.com/ugd/0994f9_b3eb9bd489544716ade1d4da646f3838.pdf?index=true
    • https://6cbe2f5c-748b-4bc6-b691-25a968a47885.filesusr.com/ugd/d6b5da_1664fbb9a95c4c67a51fdccb8ff0a200.pdf?index=true
    • https://s3.amazonaws.com/tomaxade/cricket_arm_guard_size_guide.pdf
    • https://s3.amazonaws.com/winumigutam/madrid_luxury_shopping_guide.pdf
    • https://s3.amazonaws.com/nagev/short_professional_bio_template_word.pdf
    • https://s3.amazonaws.com/febopa/blue_piston_bluetooth_speaker_manual.pdf
    • http://pefimubis.myartsonline.com/vidof.pdf
    • https://6ddb26ad-aa8e-4a3e-a925-5cef6fc035e1.filesusr.com/ugd/d3d820_69b9496869d344458828f9843360edc1.pdf?index=true
    • https://856cb5e6-6c81-45ce-9604-b57907a15cd2.filesusr.com/ugd/cc3ca9_5b7e7b1796674ff4860c15ca7ec87963.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011a74.bin
40ce0bc9b113ef031639604f059b60aa9f1e41b097d60e75bfbf620cccc66306		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A74 2900 bytes
font_01_sfnt_off000124b8.bin
7c4307a6ed1395ff2c6d3a92bbb864bf77e0986cbe223a08a4b4dd04baccbc56		 pdf-font-stream PDF embedded font (sfnt) at offset 0x124B8 5624 bytes
font_02_sfnt_off000137c3.bin
e56b2153cbb5d6899726497aa4f7a4b3324055d3d9f28ecf3cfa76003a82fd7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x137C3 11768 bytes

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