Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a86630515e0925f…

MALICIOUS

PDF

102.6 KB Created: 2021-04-27 10:41:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 43820413ba29d06eb85907c7321081f0 SHA-1: 2285bc0aaa63f33c11d134155597f60e6c256b94 SHA-256: 1a86630515e0925ffa354d5daa66ac9069674e721810e146a1086d1134f0dfdb
156 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with one prominent URL pointing to 'jacksth.ru'. This heuristic, combined with ClamAV and ML detections, strongly suggests malicious intent. The document body, though heavily obfuscated, appears to be a lure related to 'how to change oil husqvarna tractor', likely to trick users into visiting the malicious domain for phishing or malware delivery.

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://jacksth.ru/strik?utm_term=how+to+change+oil+husqvarna+tractor
    • https://cdn.sqhk.co/vujenibolo/hihcgf6/romusodezeberorinuvep.pdf
    • http://wuledorifik.22web.org/8979935654.pdf
    • https://cdn.sqhk.co/sizozizaj/1QibSkh/22476879044.pdf
    • https://static.s123-cdn-static.com/uploads/4446286/normal_5fcd31d529478.pdf
    • https://cdn.sqhk.co/letinumi/ajciicr/63055490886.pdf
    • https://cdn.sqhk.co/letarezetap/iihhef5/96373328558.pdf
    • https://cdn-cms.f-static.net/uploads/4468267/normal_603d97e0d878c.pdf
    • https://cdn-cms.f-static.net/uploads/4501037/normal_602fa9c8f169b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b588d7b7-6e4f-46c1-9ba0-b87f007e5cb0/liguwozigopopatab.pdf
    • https://uploads.strikinglycdn.com/files/241c1dda-79ce-41b3-a6f1-635c0f5bcbc3/7912662264.pdf
    • https://c4bedd8b-a3e9-4aa8-9751-a6fde4035b7e.filesusr.com/ugd/037f08_9fd511bb5d53401aaf0c3a6788449a67.pdf?index=true
    • https://uploads.strikinglycdn.com/files/036e33c4-6dd4-4925-b266-8ba10830b909/how_to_set_up_midland_gxt_walkie_talkie.pdf
    • https://aed0ee3a-d217-4696-a563-de9ff15d6c37.filesusr.com/ugd/f80e3f_4d14893c73764f9daeb89911d1609979.pdf?index=true
    • http://nomekerileme.epizy.com/mezukekukazidog.pdf
    • https://f18b8dc1-3ce9-44bd-8712-01435d039869.filesusr.com/ugd/b97cba_cdbf84fe9a224734aaa7fda4ed5f73b0.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e8be2080-d34f-4873-8d3c-471dc97869b0/57330683395.pdf
    • https://uploads.strikinglycdn.com/files/d1c5d0ce-6e04-4dfb-b6b4-e0b9a4b06a48/pewotibofojebu.pdf
    • https://814cba0f-f649-4223-bfe6-7884e6e02b9d.filesusr.com/ugd/c1108c_74e97f7f44394377ae35b91ef2f76fd5.pdf?index=true
    • http://gapuduta.rf.gd/pruebas_de_bondad_y_ajuste.pdf
    • http://rurejotalovulu.rf.gd/88388241130.pdf
    • https://uploads.strikinglycdn.com/files/5a3dd008-0c14-42ab-af90-4ff2744beb0b/what_is_form_102_and_103.pdf
    • https://332892e0-6a2b-40ad-946e-e7c92c61c867.filesusr.com/ugd/3e5d97_d65444490bed4683a18028e644b49fb7.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013be1.bin
d3c8766fa0e19126ad263e9e47b15148ec696b1d1fb421d8f30a4bc896057f99		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13BE1 5300 bytes
font_01_sfnt_off00014dfc.bin
b7af77f845fd75683e83c57b61ae81ae1bf3840e3bd6d3a0df985ed9f8eadaf7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14DFC 12908 bytes
font_02_sfnt_off00017751.bin
1ffca1ef16be5e2ec436e77f9211a88ad3199dc781cb76600401cc2e2c7dce6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17751 16140 bytes

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