Malicious PDF — malware analysis report

Static analysis result for SHA-256 e06993a388f24b16…

MALICIOUS

PDF

75.5 KB Created: 2021-03-26 08:21:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: f948de0aaf654aa2b22f34808a60dcde SHA-1: d5c977a4b7bef93e6ae62ac1642b8712bccdd417 SHA-256: e06993a388f24b16c455a9b19bd06e4dbf3133bc7a666b83ac917e1123fdc1c2
134 Risk Score

Malware Insights

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

The PDF contains multiple external URIs, including one pointing to 'xajibur.ru', which is flagged as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest a phishing or malware distribution attempt, likely initiated via spearphishing.

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/award?keyword=math+olympiad+books+pdf+free+download PDF link annotation
    • http://jukekelexoseda.22web.org/98927639682.pdfIn PDF document text
    • http://penaxuwilamufo.iblogger.org/speaker_of_test_failed_android.pdfIn PDF document text
    • http://regikumavow.22web.org/pibabetiwipofipijofa.pdfIn PDF document text
    • https://paratokoke.weebly.com/uploads/1/3/0/7/130739311/wonemidewazu.pdfIn PDF document text
    • http://zitutetek.22web.org/buell_1125r_workshop_manual.pdfIn PDF document text
    • https://fuvenaxumegiga.weebly.com/uploads/1/3/3/9/133999500/504228.pdfIn PDF document text
    • https://zapijuwubasu.weebly.com/uploads/1/3/4/8/134866543/1293168.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ddb0fe67-a09a-413d-b59a-c21b1dde3186.filesusr.com/ugd/3f0e57_a0b87ab4c03c4f179339f8d868127bb2.pdf?index=trueIn PDF document text
    • https://3c86e5df-9a55-47dd-9d5b-c207b25ec6cd.filesusr.com/ugd/72bf36_336ac6321087494f84b5d3f5c23238f8.pdf?index=trueIn PDF document text
    • http://desovizipelo.onlinewebshop.net/43705157405.pdfIn PDF document text
    • https://s3.amazonaws.com/gajakelegeza/mefuxorukimajufu.pdfIn PDF document text
    • https://9d03b195-5c34-4993-8a23-519dd2bddccd.filesusr.com/ugd/9ac058_c165f2645dcd44cfbc97d794ea61636c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb2f45b9-67f2-4490-9654-5475fb52a214/how_to_winterize_an_rv_with_air.pdfIn PDF document text
    • https://s3.amazonaws.com/gapivegek/vazevokidenixudof.pdfIn PDF document text
    • https://s3.amazonaws.com/rurovikejigibu/25789886996.pdfIn PDF document text
    • https://s3.amazonaws.com/zalisujezajaje/kathi_theme_music_ringtone_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jovekus/brother_hl-2270dw_toner_error_reset.pdfIn PDF document text
    • https://96a9e3af-f0c3-4048-9e6c-0ad8da3c6018.filesusr.com/ugd/15d534_7d76e3ceda7246209ae7667d5ae85204.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5442dd19-6d89-4cfc-ad21-125f563023b5/defusejurotoxi.pdfIn PDF document text
    • http://kamaxunavag.epizy.com/95642742885.pdfIn PDF document text
    • http://kepawomokatuke.myartsonline.com/kerawafefekivijapizife.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_off0000e7f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F6 5684 bytes
SHA-256: b371a44dc1642b6c0d8ebb205d14ead7cb1cf676e5a8bd3b9df7ff1c820b3e24
font_01_sfnt_off0000fb3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3C 11084 bytes
SHA-256: a0c537befbe1d46af876e0c832c8b56aadbe81ce84d4e5b045f4c4a6d673846c

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