Malicious PDF — malware analysis report

Static analysis result for SHA-256 24c5268b70eb0ace…

MALICIOUS

PDF

72.9 KB Created: 2021-04-05 01:37:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 258c22d262a29410d4bff5182e2dac8c SHA-1: 1a64f2f7ba9c01d268fe5d783297f84e5e1f2d27 SHA-256: 24c5268b70eb0ace4d4426698446947ca0ffa80b65e161a2440ee111517d6fdb
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for phishing or malware distribution. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of links, suggesting an attempt to create a link farm for SEO manipulation or to host malicious content. ClamAV detection and the ML classifier strongly indicate maliciousness. The embedded URL points to a suspicious domain, likely serving as a lure for a second-stage download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://golowaki.ru/award?keyword=airmen+selection+syllabus+pdf
    • https://nuvosukive.weebly.com/uploads/1/3/4/7/134718285/tebagokimuxe_marirarefuked_kitaxivab.pdf
    • http://jirafka.space/sonotawofofixik00sj1.pdf
    • http://masito.space/88312594167gmjep.pdf
    • https://safubijob.weebly.com/uploads/1/3/2/6/132682970/1537197.pdf
    • https://cdn.sqhk.co/pibexezases/haichg7/pikozovofepet.pdf
    • http://instapriz365.site/sat_practice_test_1_scoringtqlkl.pdf
    • https://linoraza.weebly.com/uploads/1/3/1/4/131437671/tevinarivibu.pdf
    • https://xijeruwenuvu.weebly.com/uploads/1/3/4/0/134018409/4349989.pdf
    • https://lufukosiresefo.weebly.com/uploads/1/3/4/7/134707539/829c442f.pdf
    • https://naloxepakore.weebly.com/uploads/1/3/5/3/135391327/c1f7a7f07fba741.pdf
    • https://cdn.sqhk.co/maxevurux/CZhjhhy/78728802103.pdf
    • https://danuxuzajuzawo.weebly.com/uploads/1/3/4/7/134768569/32b8dc86387a.pdf
    • https://wegogutez.weebly.com/uploads/1/3/4/3/134310606/bixufotufeweji.pdf
    • http://eslife.pro/nanawimazirevu8bdow.pdf
    • http://yewes.space/141728410549vntp.pdf
    • https://tugovupovo.weebly.com/uploads/1/3/1/3/131380456/4723821.pdf
    • https://dewofawofuzujo.weebly.com/uploads/1/3/0/7/130775987/f4c6f5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zagubip/electrolux_oxygen_air_cleaner_manual.pdf
    • https://s3.amazonaws.com/rirusozo/kawidupexawemabitu.pdf
    • https://s3.amazonaws.com/dowavelaxam/fozegerosafulobopodi.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_off0000dd90.bin
9c66dd4602ff055fff5c1fe511e4ec42f28388ed2e556eec4b2797bb0c779953		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD90 5532 bytes
font_01_sfnt_off0000f04c.bin
119eaa145573a6c1e173f82ee6ea18fc1aaf3eb662f8599b627d32921c569a45		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF04C 10784 bytes

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