Malicious PDF — malware analysis report

Static analysis result for SHA-256 e20373740823382e…

MALICIOUS

PDF

55.4 KB Created: 2021-10-01 10:04:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5362a6adf6d996bc2965c1ee845be53f SHA-1: 30d73395711adb677f8442e804a043ff65ddff21 SHA-256: e20373740823382e4501778695bbf37268c9bfccc211eea33bc5aaecc1a48e59
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many of which are algorithmically generated and hosted on disposable domains, indicating a link farm designed to obscure the true destination. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification further support its malicious nature. The primary attack pattern involves directing users to potentially malicious or phishing content hosted on external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6689

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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
  • 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://school19-zav.ru/userfiles/file/60363641591.pdf In PDF document text
    • http://ambulatorioveterinariosantanna.eu/userfiles/files/47587509681.pdfIn PDF document text
    • https://sy-chemical.com/UserFiles/file/74354676074.pdfIn PDF document text
    • http://it-hair.com/userfiles/54086069535.pdfIn PDF document text
    • https://telenovella-bg.com/files/difuwapunirata.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/92986413826.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/tudiruvikerowodeworo.pdfIn PDF document text
    • https://b7b.reviewz.eu/app/webroot/files/userfiles/files/jixezeguwanurefitur.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/kibiwesaxomur.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/40824497445.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/81425649646.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/datitozizo.pdfIn PDF document text
    • https://www.znackakvality.info/files/14803524311.pdfIn PDF document text
    • http://lunaleo.pl/userfiles/file/datopaxagujaduperesizop.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f884a8171e---ronofivijufududujozepe.pdfIn PDF document text
    • https://careerexpo.alljobsinliberia.com/ckfinder/userfiles/files/53625893035.pdfIn PDF document text
    • http://centronegozi.com/public/21115847298.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/gizajumux.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///20210926112538_1007696673.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/161335fd48778c---rugegatibawuxivimefapoxaj.pdfIn PDF document text
    • https://samsungdvmklima.com/upload/ckfinder/files/34271213610.pdfIn PDF document text
    • http://jeykrishnaclub.com/images/file/samuzezukibizananojavosi.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/59218420978.pdfIn PDF document text
    • http://thuonghieutoancau.vn/uploads/files/sufeduzil.pdfIn PDF document text
    • https://stthomasorthodoxchurchsouthpampady.com/userfiles/file/gafadotunus.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/jonosuwonifu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=android+baseball+gamesPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b1f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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