Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc8669d0f5dd7253…

MALICIOUS

PDF

83.2 KB Created: 2021-05-08 02:01:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 07103a9e50a5cb0d9611c8c9d3def520 SHA-1: 52727f0590105d43271e91004c7dc1ce4b06c1b3 SHA-256: bc8669d0f5dd7253586952b2724e2cfbf14bd2f1137c1200cfac515e44a0cb93
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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=rinnai+tankless+water+heater+error+code+11 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4481282/normal_603f1f2801463.pdfIn PDF document text
    • http://nadefememidep.medianewsonline.com/botrytis_cinerea_strawberry.pdfIn PDF document text
    • http://giwidesavezur.22web.org/48826344859.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482190/normal_5ff4eda5ae612.pdfIn PDF document text
    • http://voirlo.xyz/govowinewegerazononukiluzzaq2r.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421213/normal_5fef5a0a9fae2.pdfIn PDF document text
    • http://gomuleg.22web.org/d._a._r._e_book_answers.pdfIn PDF document text
    • http://powusonuruw.22web.org/78231040083.pdfIn PDF document text
    • http://sq11mini.com/xaginonm52o4.pdfIn PDF document text
    • http://senigudalow.iblogger.org/xovevomikozosamolav.pdfIn PDF document text
    • http://bigomipami.22web.org/inequality_for_all_graphs.pdfIn PDF document text
    • http://jerunuju.mypressonline.com/naperojirigaguwewepego.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • http://vumogegotawugub.mypressonline.com/42780442108.pdfIn PDF document text
    • http://julaximufe.66ghz.com/manualidades_para_nios_sencillas.pdfIn PDF document text
    • http://juilopkiretlo.ru/zebasaxepijapuao1jr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494136/normal_606de6c0cbb02.pdfIn PDF document text
    • http://mamefumiwuto.mywebcommunity.org/celebrate_recovery_inventory_worksheet_printable.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404520/normal_6067da88e8ad3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dupunijasazo.epizy.com/sheng_siong_group_ltd_annual_report.pdfIn PDF document text
    • http://tegedibe.epizy.com/magnavox_sdtv_tuner.pdfIn PDF document text
    • http://zidegegizuvodin.epizy.com/ecdc_measles_report.pdfIn PDF document text
    • http://banidokote.epizy.com/convert_excel_file_to_ascii_format.pdfIn PDF document text
    • http://tatikipebufufa.epizy.com/zapizuvujakukanifameluk.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_off00010728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10728 5244 bytes
SHA-256: c73df97c0834ac5bc70655934faa7eb731eb6ac18abb145c84cdf0fdc1af4263
font_01_sfnt_off00011913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11913 11228 bytes
SHA-256: 875fbe733440c033cacbecd0b36dfad2df84f52572a88f5e32a686b98afe230f

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