Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f200db52249dc57…

MALICIOUS

PDF

81.4 KB Created: 2021-03-13 16:26:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 7a08c93fa1c61c8fcc08f117885da55b SHA-1: 940bb8ca13ba82139a9434f4cf101e957cb80bdd SHA-256: 3f200db52249dc573446951673014e685a50b1efaf63c66752d3e8bc57b19fb9
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://jottigo.ru/strik?utm_term=nanda+nursing+diagnosis+for+knee+pain PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384036/normal_6045033d0798e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496586/normal_5fef86aa61532.pdfIn PDF document text
    • http://cabinetsop.xyz/trials_of_apollo_book_5_audiobook_freem1wbv.pdfIn PDF document text
    • http://zaxegod.getenjoyment.net/11873439168.pdfIn PDF document text
    • http://vevaxogejaz.scienceontheweb.net/basics_of_java_language.pdfIn PDF document text
    • http://creditchecktotal.info/turiruvijugalalefenezawdy6kl.pdfIn PDF document text
    • http://mujuwowewo.22web.org/wekavemovop.pdfIn PDF document text
    • http://zitukuwekoba.sportsontheweb.net/acute_glomerulonephritis_post_streptococcal_infection.pdfIn PDF document text
    • http://axecheat7.xyz/driver_installation_failureca6be.pdfIn PDF document text
    • http://mopowataxix.medianewsonline.com/definite_articles_in_english_exercises.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367308/normal_5fe106e11647e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pivimufe.atwebpages.com/what_are_the_social_problems_of_indian_society.pdfIn PDF document text
    • http://pusaxedufa.rf.gd/govalixajisipim.pdfIn PDF document text
    • http://pezilijino.rf.gd/85933982709.pdfIn PDF document text
    • https://s3.amazonaws.com/jimugivos/zuzib.pdfIn PDF document text
    • http://gozenabuzixi.onlinewebshop.net/3693875034.pdfIn PDF document text
    • https://s3.amazonaws.com/vidadaviwal/64868955368.pdfIn PDF document text
    • https://s3.amazonaws.com/litunux/related_work_template.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC97 5212 bytes
SHA-256: f9b36a8252ed9a6759cca5ca02749a2307fac2c57d8ded9512c6ec46e92005dc
font_01_sfnt_off0000fe6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6C 10608 bytes
SHA-256: bb80e181a897c0408f273aaa691ab4a0f2c9d49a45ab911f2f45a0505e7421e6
font_02_sfnt_off000122f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F2 16088 bytes
SHA-256: f52bd4b593644f02f0f619435e5fa065f797232cc4e46520c8624770b7971a45

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