Malicious PDF — malware analysis report

Static analysis result for SHA-256 4624886e62376e32…

MALICIOUS

PDF

71.9 KB Created: 2021-09-12 19:26:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 5d012cc87f7508f162454507034e5b2f SHA-1: 4da4afc595608f9642887b734a9885d7d7d111d2 SHA-256: 4624886e62376e32fcbc6249d881bac953d16655ce6d915ac1314cd6de494d07
126 Risk Score

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 0.9840

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 http://www.tractortools.cz/ckfinder/userfiles/files/votiniliforibupime.pdf In PDF document text
    • http://9275522-travel.com/userfiles/file/bamadurabogikudatemir.pdfIn PDF document text
    • https://mysmartedu.com/uploadimages/files/kawesogajamoxemitakefete.pdfIn PDF document text
    • https://cryptobasics.biz/uploads/files/davapotebedomokesurina.pdfIn PDF document text
    • http://americasbestwingspa.iorderfoods.com/uploads/files/94135603121.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/579ad624e98b75b54fdabfa80ce98a00/sabenefedogibeluriwi.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/tivagaparawawufevi.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/kogolomuriz.pdfIn PDF document text
    • http://www.bandungmesin.com/file/39971029960.pdfIn PDF document text
    • http://vhz.cz/user-files/tusajusugaladezojobo.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/posudisijikuvuzoso.pdfIn PDF document text
    • http://garderoba.sk/images/_file/xiwidexojebifaxu.pdfIn PDF document text
    • http://dinhviht.com/images/newtech/files/40238552906.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/17950386414.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/b79f880e34f8eb5f274d3ba58f5d7428/livadubutijuf.pdfIn PDF document text
    • https://premium-house.uz/images/file/manosunoxatefajo.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/kuvametok.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/relezinagujapidipapivod.pdfIn PDF document text
    • http://wowbond.com/upload/Fckeditor/file/30168529738.pdfIn PDF document text
    • http://pro-customer.de/userfiles/file/lijofumokujatikazegen.pdfIn PDF document text
    • https://eurouniversal.eu/ckfinder/userfiles/files/36173045158.pdfIn PDF document text
    • https://priscar.com/documents/files/74438742511.pdfIn PDF document text
    • http://topstec.com/d/files/62507419245.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202109021015265677.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/17311895404.pdfIn PDF document text
    • https://libertyrealestate.in/ckfinder/userfiles/files/mekipaxetadukanemajevu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=what+is+the+best+navigation+app+for+androidPDF link annotation
    • 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://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_off0000b938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB938 10932 bytes
SHA-256: c46487878c1ecffc79879fe0893bdaa53f44757ca40a582fb9ae96840143ec6e
font_01_sfnt_off0000d21c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD21C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2E 15552 bytes
SHA-256: 2af653cc76c150aa26662d0cdf0ec60afe5eb7c08888fce5d4461414ed6cf3a7

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