Malicious PDF — malware analysis report

Static analysis result for SHA-256 6937fb0977be2463…

MALICIOUS

PDF

82.0 KB Created: 2021-05-04 02:19:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 353ffb810d1a321af116d0cfeba61e99 SHA-1: d58c4c9272f8c99e9260fbe8390b514b822cc277 SHA-256: 6937fb0977be24635f417f2da8852d7f7a92c2523f1107f3086570af802a92cd
164 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used for SEO spam or to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing or a trojan. The document body, though heavily obfuscated, appears to be a lure related to 'natural acne cure', which is likely a pretext to disguise the malicious link farm.

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://leonvi.ru/strik?utm_term=how+to+cure+acne+overnight+naturally PDF link annotation
    • http://movawizaxaxato.mywebcommunity.org/same_meaning_words.pdfIn PDF document text
    • http://creditinquiry.info/koguwenatibinawurokixufaxsosh.pdfIn PDF document text
    • https://wudumimimi.weebly.com/uploads/1/3/4/3/134356267/rezifal-nitovasuv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420018/normal_6069e7703ab14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393361/normal_6020c9c726d63.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403534/normal_5fecc4af4712e.pdfIn PDF document text
    • https://mimejomukokije.weebly.com/uploads/1/3/4/5/134510045/9b56407b.pdfIn PDF document text
    • https://vatovuturok.weebly.com/uploads/1/3/1/8/131856009/1469376.pdfIn PDF document text
    • http://afracheat9.xyz/comedy_central_roast_2020_ticketsce6vl.pdfIn PDF document text
    • http://carishr.com/lijuponulixu6nyar.pdfIn PDF document text
    • http://daludaja.getenjoyment.net/quimica_organica_concepto_y_definicion.pdfIn PDF document text
    • http://vevaxogejaz.scienceontheweb.net/99864126219.pdfIn PDF document text
    • http://bluetea.space/nuwapakimokebedokuqsrqe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sizabo/20030022194.pdfIn PDF document text
    • https://s3.amazonaws.com/vigevot/manufacturing_planning_and_control_for_supply_chain_management_the_cpim_reference.pdfIn PDF document text
    • https://s3.amazonaws.com/pusolefosex/everything_is_awesome_recorder_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/kikunojulejuj/bajotizufixalanifo.pdfIn PDF document text
    • https://s3.amazonaws.com/jidosatikim/vermont_castings_encore_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/gumagabu/list_of_basic_grammar_topics.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_off000103ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103ED 5096 bytes
SHA-256: 5557158c2d2c8c879adf106cd50da429d9c215327acc7e95ec34223072e29de5
font_01_sfnt_off0001155e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1155E 10968 bytes
SHA-256: 393fb37ca2ea2fc01136f06ca9c5c60a3900a61194d366acc883a39f324eb4e1

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