Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7b1cc5006c23c70…

MALICIOUS

PDF

76.0 KB Created: 2021-09-10 05:30:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 4cf9c9c93f3051a3a5d55d2889044c93 SHA-1: 4cf6f7dd1e04eeaa9d80173d0caec86e3c8ff038 SHA-256: b7b1cc5006c23c70e17865c1ed5731af6be4d547dd5a96ddff83ff9366b44f9a
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 0.9947

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://philabc.ru/uplcv?utm_term=diablo+1+ps1+rom PDF link annotation
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/161373863591d2---faxiwirutuful.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/lulajelojoxeji.pdfIn PDF document text
    • https://xtrafitcoaching.com/www/images/files/92251261153.pdfIn PDF document text
    • http://mbeautyconcept.com/upload/content_images/file/93046665223.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/zokeku.pdfIn PDF document text
    • https://tekstilkentrehber.com/upload/ckfinder/files/dibavuvokoridololudi.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/55361245867.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/subomajaresiga.pdfIn PDF document text
    • https://xtremefitksa.com/ckfinder/userfiles/files/pepimuguvusidapanevej.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613621aa7be3a---22990086597.pdfIn PDF document text
    • https://rumahbaruku.com/contents/files/3488653615.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/80631459184.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/40800885249.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/jotetunadazuka.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/kidowokelo.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/62902977975.pdfIn PDF document text
    • http://kanalizace-ul.cz/userfiles/file/26694098129.pdfIn PDF document text
    • http://www.rafaellucenaehijos.com/ckfinder/userfiles/files/68819243052.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/55784624883.pdfIn PDF document text
    • http://slstudio.it/userfiles/files/susudonogodanaloko.pdfIn PDF document text
    • http://gutachterbewertung.de/userfiles/file/toguradiriwuputewowap.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/78824463576.pdfIn PDF document text
    • https://xn----7sbbg1ddpkdc.xn--j1amh/uploads/files/32376334408.pdfIn PDF document text
    • http://labotinnghia.com/img/files/zaduxulimirapulenevon.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/sugorejamebojivip.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://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_off0000c1b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1B5 19024 bytes
SHA-256: d64b9bc8ea5350b4bfd15a55ce7e54df041c659a9a04da187073b3689096bf58
font_01_sfnt_off0000f3e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFC 10272 bytes
SHA-256: 2f9646f6d0fcebe56b239c4f06cb12e85a19f9e8195fca44723e0635596602d1

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