Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb1b115f3e2fdd27…

MALICIOUS

PDF

89.6 KB Created: 2021-03-19 16:38:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4f55562c24a23d3cb7c1756d5cd8ff7d SHA-1: 9b2c26762aa7bd75062730287be717b299c9b65f SHA-256: cb1b115f3e2fdd273d011d416ff88c9288194fcead9b47baf5029debca66fa4a
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 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://fokemale.ru/wix?keyword=oil+and+gas+internships+summer+2020 PDF link annotation
    • http://dixefez.iblogger.org/62703304837.pdfIn PDF document text
    • http://bowemesuzot.iblogger.org/46618131153.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488810/normal_5fdfd5da34d9b.pdfIn PDF document text
    • http://xitodefigatefuj.medianewsonline.com/thermo_scientific_lindberg_blue_m_water_bath.pdfIn PDF document text
    • http://vigikigopaloze.medianewsonline.com/autismo_leve_moderado_y_severo.pdfIn PDF document text
    • https://cdn.sqhk.co/nadoranur/jghJgdv/dinetazemixuw.pdfIn PDF document text
    • http://tukiviretek.iblogger.org/wajugexamu.pdfIn PDF document text
    • https://cdn.sqhk.co/xawefigi/RzFjgNF/transfer_companion_for_android.pdfIn PDF document text
    • http://sizuxofutitarax.mypressonline.com/baguvuvuzebifuzuf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408712/normal_6011b1843eb5d.pdfIn PDF document text
    • http://kidufamipowanot.mywebcommunity.org/75462180600.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wubulunonowov.epizy.com/butupujepadopugif.pdfIn PDF document text
    • https://43dda2ad-fadc-418c-a2d5-4b96cca2ed60.filesusr.com/ugd/6eca9c_64e77c47056c47ac94a471e0be20f97f.pdf?index=trueIn PDF document text
    • https://5a11eff3-0c7a-45dd-bb89-060d4d4d2060.filesusr.com/ugd/72216b_91b022bcf98a496ebaab3f5892f97fbd.pdf?index=trueIn PDF document text
    • http://gonoluripep.rf.gd/dawn_of_war_ultimate_apocalypse_guide.pdfIn PDF document text
    • http://ziwutaje.epizy.com/nezatitita.pdfIn PDF document text
    • https://168d2a81-f750-40c6-a653-3787650f980d.filesusr.com/ugd/3bcfef_134b23c3757f47c1bf611840a8f0a2bd.pdf?index=trueIn PDF document text
    • https://efed9c07-4553-4484-a419-1b844d271aeb.filesusr.com/ugd/6f475a_02ae10eaf31b4df998942af61a6c2557.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_off00011da2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA2 5672 bytes
SHA-256: bfff3c645673a5d10f75f1e9b72cb3ca94b969ca8f0842e07982907bee8d4931
font_01_sfnt_off000130c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130C0 11760 bytes
SHA-256: 7329ed94006ddf140b33e51a64fe232d55b60edc6f4a47103b1d0e1494cf3938

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