Malicious PDF — malware analysis report

Static analysis result for SHA-256 2583bf81568cf2bd…

MALICIOUS

PDF

74.1 KB Created: 2021-03-17 02:54:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 1888b29bcc935de0bd9c9f43dfc6990d SHA-1: 9f456a613ba3684892db49c5706e78aad77fedb7 SHA-256: 2583bf81568cf2bd7e033d8628c94c7f4d4dd36f311ab4d247b801d9f7f820bd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to 'jottigo.ru' and referencing 'roblox card codes', suggesting a lure for users interested in such topics. The PDF's structure and the presence of many disposable links indicate a link farm designed to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://jottigo.ru/wix?keyword=roblox+card+codes+not+used+2020 PDF link annotation
    • http://magnitoli-2ekran.site/cleaning_services_agreementuwkr2.pdfIn PDF document text
    • http://moneyindia.site/the_amulet_of_samarkand_movieey217.pdfIn PDF document text
    • https://lekusimije.weebly.com/uploads/1/3/1/3/131383821/gixabelunoguze.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453553/normal_603efb97766e5.pdfIn PDF document text
    • http://recepty-dd.info/20681352432xxtmn.pdfIn PDF document text
    • https://tujewadis.weebly.com/uploads/1/3/5/3/135312055/4bca53382e8f.pdfIn PDF document text
    • http://trokot-online.xyz/manual_practico_de_bacteriologia_clinica2rzmr.pdfIn PDF document text
    • http://ch-data-2a8fv9s.pw/56443616152t46dz.pdfIn PDF document text
    • http://habercigo.com/logo_design_with_company_name1gnt2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421471/normal_6005b0faa64eb.pdfIn PDF document text
    • http://losqutoq.online/what_is_critical_thinking_in_english71jtd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369317/normal_5fde2849554de.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://45f61934-b4a1-4335-a9e3-e142d9465b5b.filesusr.com/ugd/0dd040_548bb1e81a8a4546a3bd986a617428c3.pdf?index=trueIn PDF document text
    • http://fafaxuz.epizy.com/exceptions_to_the_octet_rule_worksheet.pdfIn PDF document text
    • http://rimuvuvipimube.epizy.com/49367936468.pdfIn PDF document text
    • https://6a543b89-810f-4a07-932c-4cc129fc401a.filesusr.com/ugd/1e5726_e6b57329c7654c1e99679365936db4ff.pdf?index=trueIn PDF document text
    • https://1fa67a36-2e8b-44cc-a955-751d80433762.filesusr.com/ugd/d85e51_e5c730b5e1bd43e1916dc68c144481d2.pdf?index=trueIn PDF document text
    • https://88bec3ce-9cdd-4818-a95b-bcf8ac49d1e7.filesusr.com/ugd/72df48_84fc6783c37e4859a9cfd002ff3ee953.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_off0000e0f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F2 5424 bytes
SHA-256: 3dfdc6d5b5d05fc186479d4231ad0253f2e0ad61ad202b858ae08747c54cacd5
font_01_sfnt_off0000f376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF376 11468 bytes
SHA-256: bc6089c2062d5e09f10353c29faa4ae591552955510f1e327b5691f4c9d8816a

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