Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aaf86a4c9c4d5d8…

MALICIOUS

PDF

70.6 KB Created: 2021-10-04 20:35:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a2acf158d641906e2ffda9a1f74772bb SHA-1: 60440637a169ed2a73c8fa9366d46b87f73d1c7b SHA-256: 4aaf86a4c9c4d5d8bcb4ae77e605ff5dd50dcc48b3e623ef67f7f1480524bfe1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to disposable hosting and link farms, suggesting a phishing or credential harvesting operation. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is structured as a link farm on potentially untrusted domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://irlanc.ru/uplcv?utm_term=offerup+fake+sellers PDF link annotation
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/kafosetugagubazadutitum.pdfIn PDF document text
    • https://exam11.menapoint.com/app/webroot/upload/files/69159838724.pdfIn PDF document text
    • https://tjpapigroup3.com/contents/files/11677265336.pdfIn PDF document text
    • http://ideal-site.ru/userfiles/file/zuwezafogafalebuk.pdfIn PDF document text
    • https://bunian-co.com/other_files/File/xigatejasirejukap.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16145203429073---39132831318.pdfIn PDF document text
    • http://dar-tom.pl/userfiles/file/139280050.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/fodumipiwekibo.pdfIn PDF document text
    • http://baozhaopharma.com/upload/files/34893790933.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/kufimi.pdfIn PDF document text
    • http://dongamold.com/fckeditor/upload_files/file/99701243671.pdfIn PDF document text
    • http://www.globalnautique.nl/upload/files/vepokukikanitaraxuvuj.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/92055949507.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/2633434132.pdfIn PDF document text
    • http://apnschool.in/singhania/downloads/file/zadavagijugoxumefisavane.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210924140822824143eogmoh.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/tikisevamiwuraregusozukux.pdfIn PDF document text
    • http://yesfabric.com/images/upload/File/zevonijaxi.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/nuzivewelidigemi.pdfIn PDF document text
    • https://sesconbs.org.br/ckfinder/userfiles/files/49271069995.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/e9d89cb43eb2de03c2f29ff6fb8d0e34/fokufofopajexojunevej.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/toloxelajatuzufe.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/76835217124.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_off0000b72a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB72A 15216 bytes
SHA-256: 7f9ef884cdc6cacf8d6728553ff62dc39248ffef67aba0d19816af21eb6debae
font_01_sfnt_off0000dde7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE7 10156 bytes
SHA-256: a98b67e9ec09c68cf917f6f415841615d05c1c491af65c45ce0feb8087d4bfb8
font_02_sfnt_off0000f4d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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