Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4b4b9c1e1ce18f3…

MALICIOUS

PDF

69.5 KB Created: 2021-03-12 14:41:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4e011b0f09a645a9dc03535311caab1a SHA-1: 837e0a67d66594a1f36fc6fa858d0b4d1eea7c09 SHA-256: c4b4b9c1e1ce18f31823c3c1904dbe964f28bb31b21e794e960ca59b33e9f788
154 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. The PDF contains a mass of external links, with one prominent URL pointing to 'jacksth.ru', suggesting a phishing or link-farming scheme. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9338

Heuristics 4

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=reasoning+ability+pdf+in+tamil
    • http://hs-life.ru/baroque_time_period_worksheet_answersw2o3b.pdf
    • http://reform-st.ru/outlining_your_novel_templaterokpq.pdf
    • https://sotivozorome.weebly.com/uploads/1/3/4/7/134733800/4388212.pdf
    • https://xewoxexe.weebly.com/uploads/1/3/4/3/134398473/vomunaduju_gujujurimaran_vewisavarigel_mejejumava.pdf
    • https://tumunonapuve.weebly.com/uploads/1/3/1/3/131379134/bf7265d3ab.pdf
    • https://senevabitup.weebly.com/uploads/1/3/4/2/134234896/febee60a.pdf
    • https://wawupibinotab.weebly.com/uploads/1/3/4/9/134900246/8abfef2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://uploads.strikinglycdn.com/files/c3b75f29-83b7-4679-bf4d-a7c9880180e0/xebezemiwaniwufuwulige.pdf
    • https://d992f69e-bc5b-430a-92d7-abfd66d0380b.filesusr.com/ugd/6f7357_45f94835663142c89fb98c0270e78f2d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/643ce2fb-cf37-4226-ba26-a9e3a2182e01/the_river_church.pdf
    • http://bokepitu.rf.gd/nordictrack_c2200_troubleshooting.pdf
    • https://uploads.strikinglycdn.com/files/696ea77f-9a7d-4d5e-93d9-e3a88d740263/vudobilewezumivuxa.pdf
    • https://uploads.strikinglycdn.com/files/af382973-c8a8-4ef1-a367-e95914da3854/el_dador_de_sueos.pdf
    • http://pepebejawu.epizy.com/tubelanobobevazamepazam.pdf
    • https://uploads.strikinglycdn.com/files/e1d241a8-db99-45be-86e4-b27fa282e9dc/81879779573.pdf
    • https://uploads.strikinglycdn.com/files/99193f28-c72e-4281-a568-bf40c2a1cfea/monster_in_paris_songs_list.pdf
    • https://56a7be67-7dca-40da-a973-69ad719fb73b.filesusr.com/ugd/fedf23_62aa189e0e3b45059b55ba447f8e413d.pdf?index=true
    • https://c2dbac7f-2075-4dc1-ad03-af0d0352bff2.filesusr.com/ugd/278743_67dcefe4bf7a4d2eb9d93f9eccc06a01.pdf?index=true
    • https://45f61934-b4a1-4335-a9e3-e142d9465b5b.filesusr.com/ugd/0dd040_502899832a284c909758772ee0d4e4b7.pdf?index=true
    • https://uploads.strikinglycdn.com/files/28501c9b-f307-4168-93e0-ae75ccb740fb/public_relations_salary_florida.pdf
    • https://uploads.strikinglycdn.com/files/4b18bb4c-354e-448c-ae34-e633fc795cc2/gijaferojik.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8be.bin
627f233bcea08f984ebebe555205de1a0aaf65dc65ee9d78a8ca520996cb97f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BE 5304 bytes
font_01_sfnt_off0000eabd.bin
cdcaa094356bc7ffa6163220420d699a5d9a76e0c612732d53de9d7e0c40cf3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEABD 13272 bytes

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