Malicious PDF — malware analysis report

Static analysis result for SHA-256 9aac0df696cdf27e…

MALICIOUS

PDF

89.0 KB Created: 2021-06-10 04:55:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: affa7b5c03b60e3329f19ac591af9f88 SHA-1: 1d3b4b26c8aa2ba910ef268d73ac8c9df34db8d4 SHA-256: 9aac0df696cdf27e44f48551a71f24c7e0ce524e7b3c7e858075e069cb9848e6
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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 https://allytemp.ru/pbw?utm_term=nfs+underground+graphics+mod PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0053cf0-53c0-4511-b5ea-8ae518f55775/accomplishment_report_format_for_security_guard.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed3af296-4316-4a43-892f-9f8f2c4fbefd/35986427508.pdfIn PDF document text
    • http://lifevuve.pbworks.com/w/file/fetch/144667602/51945318569.pdfIn PDF document text
    • http://davixezudi.pbworks.com/f/instagram_real_followers_increase_apk_download.pdfIn PDF document text
    • http://jolunatimavu.pbworks.com/f/71484903402.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a279ac3-faf9-433a-b26c-1254ece8e759/kiboxizukilo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c6c016c-3b4c-4a21-aabd-34bae7cf5a4e/sanskrit_grammar_textbook.pdfIn PDF document text
    • http://baxikufop.pbworks.com/w/file/fetch/144886431/fortnite_mod_apk_unlimited_v_bucks_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e750dea-11f2-4dc3-a400-941bf6224d56/the_go-giver_summary.pdfIn PDF document text
    • http://wezenibafasi.pbworks.com/w/file/fetch/144732624/78328798701.pdfIn PDF document text
    • http://jujirafamena.pbworks.com/w/file/fetch/144619350/how_to_know_core_electrons.pdfIn PDF document text
    • http://lekadebixe.pbworks.com/f/porter_five_forces_template_ppt.pdfIn PDF document text
    • http://bojifimaral.pbworks.com/w/file/fetch/145006203/zuramefu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89316814-93a0-428b-bc82-73508c45a27c/what_are_the_nutritional_requirements_during_pregnancy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34ba49a2-d8fb-4ba6-9ebf-7d3465c07054/oraciones_subordinadas_sustantivas_resueltas_1_bachillerato.pdfIn PDF document text
    • http://buzivevej.pbworks.com/f/subaru_impreza_wrx_sti_2007_hp.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bae65cd3-f162-49a8-913f-a30de16bd238/the_lion_king_1_1_2_google_drive_mp4.pdfIn PDF document text
    • http://javefanudosa.pbworks.com/f/93519756097.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011edd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EDD 5508 bytes
SHA-256: b5a6b2f405d20ed96e5d17bce193a8cf79c03f47f3231e6287e40964a4099ffa
font_01_sfnt_off00013178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13178 10900 bytes
SHA-256: 6625fdc4df9a3681882076376477b7a74ea397db649efa5c0a3e266a3f7b0cb4

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