Malicious PDF — malware analysis report

Static analysis result for SHA-256 448cb3ec2dd2915f…

MALICIOUS

PDF

78.8 KB Created: 2021-03-27 22:36:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 41bcfd0dc2682a7af699266dbf2fde30 SHA-1: 614326c848063d4d97603bfdb0b634eb992d7672 SHA-256: 448cb3ec2dd2915f37f9d5d891a10b3dafccab707bd54a2b9a4386d0a7e02af9
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm used for phishing or malware distribution. The primary malicious URL identified is https://soxebez.ru/strik, which is likely used to redirect users to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • 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://soxebez.ru/strik?utm_term=alpine+cda+105+auxiliary+input PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4445564/normal_60210aa4bbf36.pdfIn PDF document text
    • https://worivoka.weebly.com/uploads/1/3/4/5/134588103/titiwoluvigat.pdfIn PDF document text
    • https://jegetujo.weebly.com/uploads/1/3/5/3/135300600/gojarizoj-karoxoku-fisesi-lijawukikexa.pdfIn PDF document text
    • https://sorawujij.weebly.com/uploads/1/3/4/6/134671526/26be0f71.pdfIn PDF document text
    • https://xinewufovina.weebly.com/uploads/1/3/4/2/134235071/6285777.pdfIn PDF document text
    • http://zumanidoxup.medianewsonline.com/50519248380.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406789/normal_6030a227963ab.pdfIn PDF document text
    • http://medemukiduba.sportsontheweb.net/anemia_sideroblastica_diagnostico.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427501/normal_5ff09dd31d42e.pdfIn PDF document text
    • https://mitojebani.weebly.com/uploads/1/3/2/7/132711961/3038658.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9a4b5e96-23fe-4021-9525-787506808755.filesusr.com/ugd/b3318b_f2befab9cee74a67a3cad0da4fe671e7.pdf?index=trueIn PDF document text
    • http://mofuvenelopupo.epizy.com/pinoy_logo_quiz_answer_level_55.pdfIn PDF document text
    • http://solarujarinobo.myartsonline.com/amiga_date_cuenta_libro_completo.pdfIn PDF document text
    • https://770ad53b-b55e-4e58-b1eb-3709f41304f7.filesusr.com/ugd/98e298_6ff66eebf45e42648f4ce8e65fb465a9.pdf?index=trueIn PDF document text
    • https://807eaacf-9fb6-4e16-bcb8-061395d1d132.filesusr.com/ugd/a3ef2e_ed0aed903e0b49e393c44c2d55843f26.pdf?index=trueIn PDF document text
    • https://0b609444-e5a2-4a7e-9779-a3c6bae51a53.filesusr.com/ugd/529dbf_d14213f27cde45a68a0ca0144e422d0d.pdf?index=trueIn PDF document text
    • http://gigitepusiligo.epizy.com/87084136886.pdfIn PDF document text
    • http://niwurekatexo.atwebpages.com/biologically_inspired_robots_snake_like_locomotors_and_manipulators.pdfIn PDF document text
    • https://49432a94-54bc-4d13-9d12-ea41d731e1b8.filesusr.com/ugd/a7c689_7a461e70b1f449a6b4af28ac6163469a.pdf?index=trueIn PDF document text
    • https://70848fb0-0fd0-490a-9360-2ffa38fc212c.filesusr.com/ugd/08e331_9ed89a8fa34c49f88fec3857610dc51f.pdf?index=trueIn PDF document text
    • http://fadezanunadafik.myartsonline.com/aconitum_heterophyllum.pdfIn PDF document text
    • http://filawobabadi.epizy.com/juboniligeb.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F0 5364 bytes
SHA-256: c0e50af86f55f9c397cd5e29504aeb31b21ee23508092dbe8e4c333977700971
font_01_sfnt_off00010951.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10951 10864 bytes
SHA-256: c5aebf992938668ff74f3c67d4f06309f73f3b82164fdaaa6cdd25a5c1e4a8c3