Malicious PDF — malware analysis report

Static analysis result for SHA-256 c564fe1dcf8f5f44…

MALICIOUS

PDF

77.6 KB Created: 2021-02-09 13:05:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 561c7be9739a6716d4dbe61a1bf429ed SHA-1: ab04a3d988d21f32c5e28642d16f2d5f597edbf1 SHA-256: c564fe1dcf8f5f44945030c5c1771d6120b20132d31d8274801ebebc729ab580
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to PDF files hosted on services like sqhk.co and weebly.com, suggesting a link farm or content distribution network for potentially malicious payloads. The document body, though heavily obfuscated, contains keywords related to medical treatment guidelines, likely serving as a lure to attract unsuspecting users to click on the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/wb?keyword=myasthenic%20crisis%20treatment%20guidelines PDF link annotation
    • https://cdn.sqhk.co/noxivudeva/VS9idAA/call_of_duty_modern_warfare_warzone_vs_fortnite.pdfIn PDF document text
    • https://pujuwofox.weebly.com/uploads/1/3/4/8/134882524/sogupura.pdfIn PDF document text
    • https://cdn.sqhk.co/fulaxanew/5EWb93j/42661646700.pdfIn PDF document text
    • https://cdn.sqhk.co/firumefetev/iic2Cgf/2020_nfl_fantasy_football_rb_sleepers.pdfIn PDF document text
    • https://fodonisegijiwos.weebly.com/uploads/1/3/1/4/131437376/witunozuve_tixakasufog_kavaxuruguvebu.pdfIn PDF document text
    • https://cdn.sqhk.co/puvubuzu/8hfkQnd/snap_assistance_hawaii.pdfIn PDF document text
    • https://cdn.sqhk.co/nusuguponu/jgfiegj/mob_skin_minecraft_android.pdfIn PDF document text
    • https://cdn.sqhk.co/masamiwe/chijjvy/disney_qr_scanner.pdfIn PDF document text
    • https://cdn.sqhk.co/gobajejuz/jjhbLhf/46126699137.pdfIn PDF document text
    • https://cdn.sqhk.co/medujebukoma/aGjjYih/45339360727.pdfIn PDF document text
    • https://cdn.sqhk.co/botikavanov/jhhbhk5/danusuzibunise.pdfIn PDF document text
    • https://finubakexa.weebly.com/uploads/1/3/1/3/131383318/24d4e10f26f1.pdfIn PDF document text
    • https://cdn.sqhk.co/pelotuwew/xhfge6o/55537783301.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jefevuxivux.epizy.com/bavabuxubebirufitovo.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eeba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBA 5460 bytes
SHA-256: 4f0e75e7a93c0cb5d465fc60637850c4e12bbb3b027e430f288cd03d95276c9b
font_01_sfnt_off00010132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10132 11860 bytes
SHA-256: 7ca7e40b9b6c3150ae04c38e530d983e99798ad1cef7deb7e8009bc0d93432d0

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