Malicious PDF — malware analysis report

Static analysis result for SHA-256 37d9baa1cdae0c34…

MALICIOUS

PDF

76.8 KB Created: 2021-03-13 19:54:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3989d43d6955c372c61ec24ffb8e401c SHA-1: 287367755a5f87e0fb7971e2085077f6ea9287a6 SHA-256: 37d9baa1cdae0c34e5a03fc8764d31066c96e47e8b6748347643b89f21b50a8d
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://pelibifir.ru/wix?keyword=tree+shapes+for+landscaping PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4498971/normal_60015a3e597ac.pdfIn PDF document text
    • http://kejoxemubogese.mywebcommunity.org/dejotubakurevofuwakegew.pdfIn PDF document text
    • http://canlisohbetim.net/ant_design_form_inside_modal7nbkx.pdfIn PDF document text
    • http://esplus.pro/11548815005xhe1f.pdfIn PDF document text
    • http://kipegujodup.getenjoyment.net/unlock_mythic_adventures_sortie_quebec.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479433/normal_5fe14303abe73.pdfIn PDF document text
    • http://rofogukiluvupu.mygamesonline.org/tiwalifepupuzufir.pdfIn PDF document text
    • http://xonitaj.mywebcommunity.org/piwosedi.pdfIn PDF document text
    • http://gemubanabugawa.mypressonline.com/48394425032.pdfIn PDF document text
    • http://genusadnlo.space/sezuwapodekc153.pdfIn PDF document text
    • http://nowtorrentz.com/56621170490syn6w.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/26e7106a-b429-46c5-8c38-00b187468419/commonlit_assessment_answers_the_most_dangerous_game.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0afdc1f8-d011-4118-96ea-e97ba3435f9e/gugev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6cac92a-9dd6-4860-a2f6-4a58c99bcfb9/69732140863.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b40a1819-77aa-4bc8-b2bf-e1c6f4905dec/pefetapudixewotuxir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6779b6f6-3556-4ee2-807e-516425af154a/vazanorunitesaxatud.pdfIn PDF document text
    • http://lumosaneja.onlinewebshop.net/wawema.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0ba7d64-f19e-4eb5-b8f6-17df4b52f945/samsung_un32j4000afxza_stand.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_off0000ef6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6F 5368 bytes
SHA-256: 0a7b141d885af80eade776ac646d6b480a14a1e36ed99cf0d4061f4d169f221a
font_01_sfnt_off000101aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101AA 10824 bytes
SHA-256: 326d0afc19984bec6845d758e2601a44f725fd7e879c509f90e057852c850b2f

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