Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c221b72f03c4ea2…

MALICIOUS

PDF

79.7 KB Created: 2021-03-23 00:48:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4d6db08ce39b949e431e5ef92a43ee92 SHA-1: c105af103dd9680677e84fe1f84a895e9e92ee80 SHA-256: 6c221b72f03c4ea21551597e4e3ae117a06f6a9d264bca6b521d972e0e2fbf4c
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-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://golowaki.ru/wix?keyword=blockheads+guide+reddit PDF link annotation
    • http://wersita.fun/zikutaxabopesovni69.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465136/normal_6016e109dec24.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475391/normal_604065136fa76.pdfIn PDF document text
    • http://jisutuxoxaza.medianewsonline.com/jatawibedolulofas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490376/normal_6027fa4fd6477.pdfIn PDF document text
    • https://cdn.sqhk.co/kikutajaz/gfhhick/59006066722.pdfIn PDF document text
    • http://wovuwukotuvoxi.mygamesonline.org/junojarolofonosolosipobo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408330/normal_6018357f9a756.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389570/normal_600b454fa7637.pdfIn PDF document text
    • https://cdn.sqhk.co/lojosewude/iIyQhc2/domino_dominoes_online_apk_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/rularijulen/hhdgheX/roxukunewem.pdfIn PDF document text
    • http://trastenmyqort.online/begodekej4p0h.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nifopufu.epizy.com/fl_studio_mobile_mod_apk_download_apkpure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/523c660d-3ee2-4928-892c-909909bd5352/ledumevi.pdfIn PDF document text
    • http://dogiwexor.myartsonline.com/cisco_switch_commands_vlan_configuration.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32585278-83de-4028-816c-67a49edbeb19/65567614159.pdfIn PDF document text
    • http://xezibes.epizy.com/22945595793.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53fe8bd9-e11c-4335-b588-1d1f33f5bbf1/timex_expedition_field_chronograph.pdfIn PDF document text
    • http://tejogasev.rf.gd/online_marathi_book_reading.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_off0000f7bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BB 5312 bytes
SHA-256: 174f8f2f07d022031805bd58824916c67d14a0912f6d1929d5ea411dc055d806
font_01_sfnt_off000109c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C5 11700 bytes
SHA-256: f20359fe71d76f996525750d5cc84fb186e53b4062879cc4c792187eb7631a6c

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