Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e84d4caee6f78b1…

MALICIOUS

PDF

70.2 KB Created: 2021-09-24 14:20:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3fb1d0ef57cab6fdaecca95a5d2a2c58 SHA-1: 4bc40a444ea970234f428941916d06ce04ed0c48 SHA-256: 0e84d4caee6f78b104c06cf17c68a64d32129edfb4d0b5589b88bb74763fc11d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to potentially disposable domains, suggesting a link farm or phishing lure. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically flags this behavior. While no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://marblobath.com/app/webroot/img/files/jafekafolizovolar.pdf In PDF document text
    • http://www.de.ruben.pl/ckfinder/userfiles/files/nasajaweziwebirofixan.pdfIn PDF document text
    • https://behbehaniprojects.com/uploads/files/kelegotaren.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/lofozavejarolesemelo.pdfIn PDF document text
    • http://birdwatching.sk/media/file/33313465755.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c19d81c3d6---85235361561.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/11265338272.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/kosutovipukotewoke.pdfIn PDF document text
    • https://butyfarm.mm520.net/userfiles/files/sikuxezuxelep.pdfIn PDF document text
    • http://ave-france.com/pics/files/55253483493.pdfIn PDF document text
    • http://synergyproperty.com/images/files/lazupulupuzere.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/61652149417.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/40930410608.pdfIn PDF document text
    • http://obkladlazby.cz/userfiles/file/pezidusevuweku.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/78256633986.pdfIn PDF document text
    • https://martan.es/cenavarra_userfiles/files/kavolat.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/gapeb.pdfIn PDF document text
    • http://presssimayeshahr.ir/pic/file/32648140688.pdfIn PDF document text
    • http://standardamulet.com/files/files/20231417131.pdfIn PDF document text
    • https://www.informacion-indoorclub.com/boletines/img/file/togoka.pdfIn PDF document text
    • https://adian.eus/files/galeria/files/fabijenewisogatotik.pdfIn PDF document text
    • http://vaithun.net/upload/files/87607798531.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=android+auto+apparPDF 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_off0000b0b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0B9 10120 bytes
SHA-256: c7970516cbda2ecff0b119131b96d39ba4507252059952aff1e45f7091522a4e
font_01_sfnt_off0000c763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC763 17652 bytes
SHA-256: fed3597aa868b816013f44d635768d113862f841041dc3d97961347fd6949d12
font_02_sfnt_off0000f36a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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