Malicious PDF — malware analysis report

Static analysis result for SHA-256 05b79763db577cc0…

MALICIOUS

PDF

96.7 KB Created: 2021-02-20 23:29:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: b6c1fa5e65cccd6091aa675d0ccdeed7 SHA-1: 90fb4a5a2a7bf084e89610e1bb96103a6e2b8cfe SHA-256: 05b79763db577cc024c42d273b304196ed6d2766add2a565a56db9aff306a548
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links to disposable domains, identified as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically a phishing or trojan distribution campaign. The presence of embedded URLs and the structure of the PDF suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/wix?keyword=exponential+functions+applications+worksheet PDF link annotation
    • http://pomirkapa.site/999911871147uwuy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373509/normal_5fe2b027e5d75.pdfIn PDF document text
    • https://petekebinipaz.weebly.com/uploads/1/3/5/3/135395272/bikupiviwaf-dikanov-gikisuxebaribov-kafuvepozir.pdfIn PDF document text
    • http://steelsho1.club/fuguzotek1yhg.pdfIn PDF document text
    • https://cdn.sqhk.co/woguwubege/iVUPiiD/ufc_fight_schedule_wiki.pdfIn PDF document text
    • https://cdn.sqhk.co/leporolino/QfgjHOu/kujubidepeb.pdfIn PDF document text
    • https://cdn.sqhk.co/fajoliteve/hjSyhgh/bmcc_nursing_program_checklist.pdfIn PDF document text
    • https://cdn.sqhk.co/figegixo/G0YJ5hi/29404208363.pdfIn PDF document text
    • https://zabugejagovim.weebly.com/uploads/1/3/1/6/131637755/golarawupo.pdfIn PDF document text
    • https://nupebovewurezo.weebly.com/uploads/1/3/2/7/132710783/1739208.pdfIn PDF document text
    • https://cdn.sqhk.co/ragejeli/eggRuxN/playrix_fishdom_deutsch.pdfIn PDF document text
    • https://cdn.sqhk.co/lomasamube/iICjesD/39061393750.pdfIn PDF document text
    • https://lexikusu.weebly.com/uploads/1/3/1/4/131438729/degidudukafi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000134d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134D3 2828 bytes
SHA-256: b7f317aa0f29cd34df008dc84d8f376d2685882a57a4a5cd0d86477d0adf885a
font_01_sfnt_off00013ece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ECE 5284 bytes
SHA-256: 2f9a175652b8d84b5de7a762e7591b9488ea402685e5a62113f7bc1d5540b743
font_02_sfnt_off000150de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150DE 10000 bytes
SHA-256: ba1029f6bdb3ab0ca615667bdb6549cf3554df6462f30418f63d53d100696b5a

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