Malicious PDF — malware analysis report

Static analysis result for SHA-256 085e5c596e1e12df…

MALICIOUS

PDF

75.5 KB Created: 2021-03-20 18:27:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3f64e9457c24227cca27be4ca0052e38 SHA-1: 770e0c1a5cf36a372a3d926df1940a21aee58fd5 SHA-256: 085e5c596e1e12df128d5a216b52f7f0449c5bead8dd426d5491da6b5b9cc058
186 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 used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and external links are indicative of a phishing or malware delivery mechanism, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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-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
  • 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=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://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_off0000e63d.bin
223a0ad7bc0ddb8adca3e74c59cebec99a49b79680fd136c292aa2c91eddc80f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE63D 5292 bytes
font_01_sfnt_off0000f842.bin
bc64a10828cf0eddd20908b762e71b30ea32d57caefcffbb4a9e331feaba92e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF842 11836 bytes

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