Malicious PDF — malware analysis report

Static analysis result for SHA-256 9178e7dda4242439…

MALICIOUS

PDF

61.3 KB Created: 2021-03-20 18:27:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c070754cb7a992dafed3a2e7c41fa846 SHA-1: 6eacca49849aeb85c398c02c77ae5056a13ca38c SHA-256: 9178e7dda42424392784d6579f69f8ce3b378d47a1e13a5e05b636ff1bce658a
184 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8267

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/strik?utm_term=petsafe+wireless+fence+training+manual
    • http://xamoxipuwizutux.scienceontheweb.net/desawisuzizefafat.pdf
    • http://wivejudotimog.22web.org/ccna_v6_answers_chapter_5.pdf
    • https://nuguzawopaji.weebly.com/uploads/1/3/4/0/134040365/9059419.pdf
    • https://cdn.sqhk.co/kogewole/bwhiK1a/21011322150.pdf
    • https://cdn.sqhk.co/xuxodokoju/gibUjfx/lowuxoxewowodilubejeduwu.pdf
    • https://cdn.sqhk.co/jaxubefe/jFy6iau/kavelilikib.pdf
    • http://jakesubinosol.scienceontheweb.net/hp_officejet_pro_8600_plus_problem_with_ink_system.pdf
    • http://vixurefivero.66ghz.com/how_to_use_travel_smart_conair_luggage_scale.pdf
    • http://funusiwevig.22web.org/49051143207.pdf
    • http://gizovivomiz.getenjoyment.net/fedejosozemugunefefipixa.pdf
    • https://natadafupekex.weebly.com/uploads/1/3/1/8/131856288/mewikevoz.pdf
    • https://letateworu.weebly.com/uploads/1/3/4/3/134365764/zavisi-zolelalidel-gevafomezubax-lakenomas.pdf
    • https://cdn.sqhk.co/xeliwiwogivo/IAxjhjb/51183988551.pdf
    • https://besugadofozoxi.weebly.com/uploads/1/3/5/3/135396803/kubatovu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xawiwevivuzox.onlinewebshop.net/duperujoxedav.pdf
    • https://4a1cfc67-5981-466d-a13b-75576fe7431f.filesusr.com/ugd/64e449_30a02fcc665e4c9ca8cb49e88457bf2f.pdf?index=true
    • https://45180a89-8b92-4d54-a4c6-cdf0ad6af3c7.filesusr.com/ugd/2b98a3_5c528af33b484a44b240a584e126ab4f.pdf?index=true
    • http://xofinawudira.rf.gd/case_study_topics_in_computer_science.pdf
    • http://xidozine.rf.gd/how_to_use_a_shaker_bottle.pdf
    • http://madezenazi.epizy.com/32523948574.pdf
    • http://winuvifenam.epizy.com/vekibepo.pdf
    • https://7c3a386c-9197-44ff-a2a0-26a6be1b6260.filesusr.com/ugd/bba797_6777929b54b84d288621ad3fb01fa256.pdf?index=true
    • https://fc06435f-e709-4c80-b59d-96fa470c1a13.filesusr.com/ugd/bdc04d_a0691e6847284f3fb58b4078cd45bb26.pdf?index=true
    • https://d8acad56-eb9a-42d1-a06c-a695c5b02328.filesusr.com/ugd/0ad6c7_fb7c5aaef5ab43e3a5396d3dc62eb0b5.pdf?index=true
    • http://bidanata.rf.gd/sd_cid_format.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e63d.bin
223a0ad7bc0ddb8adca3e74c59cebec99a49b79680fd136c292aa2c91eddc80f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE63D 5292 bytes

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