Malicious PDF — malware analysis report

Static analysis result for SHA-256 73b1268c2513de82…

MALICIOUS

PDF

69.2 KB Created: 2021-02-14 20:07:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: fb885834d69e392036cd73d38ec3a40e SHA-1: 55aed7f6c352ff3246efd0d4105bd4d547f9598d SHA-256: 73b1268c2513de82fd819a37b76165bc2bec3b2494cbc06ef6ec2ce7d1c516c5
126 Risk Score

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 0.9996

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://bologen.ru/wix?keyword=scientific+notation%252Fsignificant+figures+worksheet+2+answers PDF link annotation
    • https://cdn.sqhk.co/xevowuto/Lwgfaji/53513424848.pdfIn PDF document text
    • http://olipaka.xyz/11988121336grr7n.pdfIn PDF document text
    • http://rerolakareruxom.22web.org/metastasis_adalah.pdfIn PDF document text
    • https://cdn.sqhk.co/dutedape/dmLskcF/roziwa.pdfIn PDF document text
    • https://kokagajimixepu.weebly.com/uploads/1/3/5/3/135331661/e54bc9253.pdfIn PDF document text
    • https://votetofovuwov.weebly.com/uploads/1/3/4/9/134901863/repona.pdfIn PDF document text
    • http://mini-cam2.club/16573481632jbs9v.pdfIn PDF document text
    • http://s-tochka.ru/photography_business_card_template_free_psdp4mxn.pdfIn PDF document text
    • https://biwemazisemu.weebly.com/uploads/1/3/0/9/130969041/25bd5d356e7d6.pdfIn PDF document text
    • http://milanomoda-italy.website/foxusawiwibesizedebriu.pdfIn PDF document text
    • https://zunimivivonuz.weebly.com/uploads/1/3/4/0/134017399/wapid-zopufivo.pdfIn PDF document text
    • https://cdn.sqhk.co/namulofilox/9OgfcTM/business_management_and_entrepreneurship.pdfIn PDF document text
    • http://guitar.su/free_email_templates_html_codeonbtl.pdfIn PDF document text
    • https://cdn.sqhk.co/foroboreb/4LjbUhg/bujutedaridoxofuwabu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sobogewas.epizy.com/microsoft_office_accounting_software_free.pdfIn PDF document text
    • http://jojomuge.epizy.com/tekomuxodesijimaliwisemap.pdfIn PDF document text
    • http://fezekugagow.rf.gd/75723685415.pdfIn PDF document text
    • http://nodixuzotegiv.rf.gd/46228701810.pdfIn PDF document text
    • http://jopakete.rf.gd/gudetinisap.pdfIn PDF document text
    • http://kapugekemasili.rf.gd/wutev.pdfIn PDF document text
    • http://tivapatovike.epizy.com/xagepovedo.pdfIn PDF document text
    • http://gomitobovuni.rf.gd/jumasupuni.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_off0000d128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD128 5536 bytes
SHA-256: 95e8fd50a8baade5742755b37eb145878ce29e83b430d85495e5ee4638253a4f
font_01_sfnt_off0000e420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE420 9692 bytes
SHA-256: c8334ca979d87aa810736ccf82235d9a298a1020b078c5fa9be036a2eb45a2b9

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