Malicious PDF — malware analysis report

Static analysis result for SHA-256 3953faf3aa7f8940…

MALICIOUS

PDF

76.9 KB Created: 2021-04-07 03:15:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: d6a9281673b10ae8d9c25fb4bdc0e139 SHA-1: 7cf4d4b1ec1dd9bcae328a953dc87386bb6d8681 SHA-256: 3953faf3aa7f89404581ccb7e3d2af184be55aa357c01a10ea467dc548e24d02
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to suspicious or unknown domains, suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm on disposable hosting, further supporting a malicious intent. The ML classifier and ClamAV detection strongly indicate malicious content, likely a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://vilenefex.ru/strik?utm_term=how+much+is+a+timex+watch+worth PDF link annotation
    • http://rebelliona.online/toganefisubitadupujikurewik91.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • http://copyrightsupporthelpcenter.com/7992686088031y7e.pdfIn PDF document text
    • http://fuzubijixulux.mygamesonline.org/45917487449.pdfIn PDF document text
    • http://xupokaxe.medianewsonline.com/40223640206.pdfIn PDF document text
    • http://antileqphh.site/goropusepokaluretiridibesgdh3.pdfIn PDF document text
    • http://gavojutopubiri.getenjoyment.net/libro_que_viva_la_musica_andres_caicedo.pdfIn PDF document text
    • http://lotobajigufar.mywebcommunity.org/gluten_free_casein_free_diet.pdfIn PDF document text
    • http://sdorovie-sustavi.xyz/1709979466id0au.pdfIn PDF document text
    • http://natur-bio.space/33810753366gmtl7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6762652a-e869-40f3-960d-1446d4066230.filesusr.com/ugd/55e6b1_b48f4bf99af64c40804cf22ebb4c1c66.pdf?index=trueIn PDF document text
    • https://b962d5b8-8819-42e3-9ba3-d95e8366760e.filesusr.com/ugd/f51585_d488ac76b1d441d3abefb3b1584d1982.pdf?index=trueIn PDF document text
    • https://1e16f6d7-285b-4488-bf07-d3e24ac90e20.filesusr.com/ugd/417718_1f943b5a83ad4ea09438480534b6828a.pdf?index=trueIn PDF document text
    • https://77bc4ea4-de20-41c0-a463-a5315db628d9.filesusr.com/ugd/2c69e3_31972cdb2c3f46e38ef5612704fd6620.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kewakuko/get_your_guide_iceland_tripadvisor.pdfIn PDF document text
    • https://s3.amazonaws.com/sepovutapakogaf/jixife.pdfIn PDF document text
    • http://tisavan.onlinewebshop.net/bade_bhai_sahab.pdfIn PDF document text
    • https://61090d85-22e6-4724-b969-52a17785150c.filesusr.com/ugd/952c2e_160e0945da32439ab967c30bea2546c2.pdf?index=trueIn 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_off0000efe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE4 5128 bytes
SHA-256: 4d010b14bedccc2a5eb8ca8e83e982af1b3eb60143c539ce71d60106bf959458
font_01_sfnt_off0001013b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1013B 11264 bytes
SHA-256: 57210377b6cfd8c2aaa2e93a458d5948eb3adedc46fec4aa06a9235e7d13c504

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