Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c71fc4b2bb3fa9b…

MALICIOUS

PDF

70.7 KB Created: 2021-03-31 21:14:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8ff54ee0fcb22d1c5d3d9d9c59b87e89 SHA-1: abaee13a32dc439df7ea14b2f840cfd4993afa78 SHA-256: 3c71fc4b2bb3fa9b56cf339b7d3ab8879bcdd60c28546ad5a24d3c918e779442
184 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier indicate malicious intent, likely to redirect users to phishing or malware sites. No scripts were extracted, but the embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7004

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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/award?keyword=ielts+difficult+reading+practice+test+pdf
    • https://fadefewili.weebly.com/uploads/1/3/4/3/134316521/543b18abf.pdf
    • https://cdn.sqhk.co/zugivakizo/hjiLvhg/animal_jam_classic_free_membership.pdf
    • https://cdn.sqhk.co/dokijesu/g7jaBgc/bedaz.pdf
    • https://cdn.sqhk.co/libavesonon/hih9UTK/56534922597.pdf
    • http://kazaxukiga.getenjoyment.net/armas_biologicas_en_la_segunda_guerra_mundial.pdf
    • http://mupifojoxur.medianewsonline.com/82725001481.pdf
    • https://vepenisa.weebly.com/uploads/1/3/4/3/134339982/zivewifo-riwewijip-venupe-nosiwefila.pdf
    • http://jivavesomuviz.getenjoyment.net/vufopezaxibetajuga.pdf
    • https://fiwobezamarevev.weebly.com/uploads/1/3/2/7/132740324/0298fffdb362c.pdf
    • https://cdn.sqhk.co/nutubejagut/ldxidy1/51127326390.pdf
    • http://munupesifak.22web.org/embodiment_of_evil_full_movie.pdf
    • https://vezutubiwewo.weebly.com/uploads/1/3/4/5/134507618/lutavunasirija.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://f1cb2ec4-a82d-4768-8a06-5236a2db220e.filesusr.com/ugd/a2e20a_31f73f4699d34e1db7e4b6ad6b245146.pdf?index=true
    • https://e2604e0b-f95a-4acb-b53f-a7db3827b2a1.filesusr.com/ugd/225520_1eea35102ff6496a8ce3d01cae3e5abd.pdf?index=true
    • http://vedirananu.epizy.com/xinozevulidapilotakimulu.pdf
    • https://ebc1add8-0b9d-418e-9e4a-1e287827e933.filesusr.com/ugd/ab63e3_441f8e8dc32541adbfa7978d830196e4.pdf?index=true
    • http://kefabebabefi.rf.gd/90016039953.pdf
    • http://tixiwepire.epizy.com/honda_moped_service_near_me.pdf
    • https://5c3e38fa-bf2d-4cda-bfdc-19e9a39f2227.filesusr.com/ugd/b3ada4_e83ff160f6ac41ff9ab7c43421119b68.pdf?index=true
    • https://7fca5364-97a1-4441-b76e-d2c429a59218.filesusr.com/ugd/735424_493fd14975ef4c5dad4d433399557cb1.pdf?index=true
    • http://dejosabo.epizy.com/vegemareduriwozoxutuk.pdf
    • http://nudumen.rf.gd/best_adblock_browser_android.pdf
    • http://timerojulawu.myartsonline.com/visenasal.pdf
    • http://fenubamijub.epizy.com/bumblebee_car_wallpaper.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4bc.bin
2cb78f399db6fa008ebcc767ebf4b73d90cf2f354edd4dcda64b0f0e80bdd4d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BC 5260 bytes

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