Malicious PDF — malware analysis report

Static analysis result for SHA-256 d51b23921bbba41e…

MALICIOUS

PDF

101.1 KB Created: 2021-04-22 16:13:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 379d99e8b651853c76ee49647ece2f31 SHA-1: d8b6e885705dfb72f530026a7d240b07debffe69 SHA-256: d51b23921bbba41e96a2f1c6383dfbaac1fb4e23473e5685535a57bd2a2bde46
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many pointing to disposable domains or potentially malicious hosts, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ClamAV detection and ML classifier also strongly suggest malicious intent. The primary purpose appears to be directing users to external content, likely for phishing or scamming purposes, rather than containing an active exploit within the PDF itself.

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://xajibur.ru/strik?utm_term=night+owl+x+no+signal PDF link annotation
    • http://kodutizaga.mywebcommunity.org/5091989733.pdfIn PDF document text
    • http://gejokakop.mygamesonline.org/41579489539.pdfIn PDF document text
    • http://jemulobapamiwu.mywebcommunity.org/71194662582.pdfIn PDF document text
    • https://wanevowak.weebly.com/uploads/1/3/4/4/134465130/wiked.pdfIn PDF document text
    • https://cdn.sqhk.co/nokikifabaf/9mgj5Gg/femuloxixejofiwuwaponur.pdfIn PDF document text
    • http://smeh-mif.space/dazir1phz3.pdfIn PDF document text
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • https://pofimutazotoxo.weebly.com/uploads/1/3/4/0/134000188/1862038.pdfIn PDF document text
    • http://maxist.ru/simebuzimerurwnb.pdfIn PDF document text
    • https://cdn.sqhk.co/sewadokoka/5ichgd5/76080760004.pdfIn PDF document text
    • https://tubolapibakosi.weebly.com/uploads/1/3/4/8/134872187/8121be7.pdfIn PDF document text
    • http://trylait.club/troubleshooting_kenmore_ultra_wash_dishwasherybbh7.pdfIn PDF document text
    • http://xrootunited.com/miracle_box_frp_unlockrkizn.pdfIn PDF document text
    • http://thrivewebs.com/barbie_doll_cake_photouim3q.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/1fe393bd-b97f-4df9-9429-41443876d510/sofebonozebite.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/955b9e3d-13ef-498f-8950-b27fdc5beaf5/46470457952.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a450e70-d130-4d19-a9a8-a26f16255606/entry_level_graphic_designer_salary_los_angeles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ddaa15e-bd20-43a0-a4f1-6e0e5f7ec044/bosch_brute_jackhammer_repair.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001419f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1419F 4652 bytes
SHA-256: 83f6a79062cf4eb03fc48928f8bf6c2b42b1028f3801f42e0b2601121f9099a3
font_01_sfnt_off00015177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15177 11840 bytes
SHA-256: c49073e7970d199461558d43df2ba1a0673724adce9e7ebe2429be9592eefd65
font_02_sfnt_off000178d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178D9 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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