Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4f0a824e91c7d63…

MALICIOUS

PDF

84.1 KB Created: 2021-03-29 07:03:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 6bc34ab559a436c92b89e42f277b9b84 SHA-1: 4d14b3110a5fca8ce12d325399aacbd5418341b4 SHA-256: d4f0a824e91c7d63123e4649d676b99e3264ebf4255bfebb13fbda5c539024e5
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://maypoin.ru/aws?utm_term=francine+prose+reading+like+a+writer+review PDF link annotation
    • http://rovonafitapos.22web.org/sijewonedar.pdfIn PDF document text
    • https://cdn.sqhk.co/wimiwupo/ghhi2fe/la_liste_de_schindler_acteur.pdfIn PDF document text
    • http://zerusuwunilex.22web.org/personal_secretary_job_description.pdfIn PDF document text
    • https://cdn.sqhk.co/xamitarerivu/hgfTNCE/screen_stream_mirroring_apk_full_version.pdfIn PDF document text
    • https://cdn.sqhk.co/mitugejaxel/ioTXhbL/42190119359.pdfIn PDF document text
    • https://cdn.sqhk.co/punenekebi/hhBMhjV/78683562772.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://regusew.epizy.com/beethoven_moonlight_sonata_2nd_movement.pdfIn PDF document text
    • https://s3.amazonaws.com/besafefaf/how_to_scan_documents_on_canon_pixma_mg2520.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18cf6ef9-50a3-4d27-bf4d-3b9ab283d691/components_of_report_writing_ppt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/781ed5bd-d978-4f89-b3c2-a65e5ff87bd2/15904106552.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a4352aa-9e4e-4f40-84a5-0d0bf754bae3/ravagibala.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35801cb1-58ac-4657-a98a-635252e3f768/teaching_word_families_kindergarten.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3d70ea0-3107-4204-8a3d-4182844071bd/ninja_professional_blender__nutri_ninja_cups_bl621.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efcc14b0-be5f-4f49-a021-3d61aa07bee1/22713066611.pdfIn PDF document text
    • https://041aa876-b65b-432c-96c0-58c8b295a4e4.filesusr.com/ugd/90d19e_0221c3be957f47b393fe2ad671b465b0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lijulijowivaze/1972_chevy_truck_build_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7020c77-aa7e-4156-a217-92730fe44922/what_are_the_best_air_fryer_cookbooks.pdfIn PDF document text
    • https://8b83d164-5e56-46cc-b941-48f48810ddf3.filesusr.com/ugd/76ce43_1333b1b0d0344a66b07e5e86713700a6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6319928d-befa-4dbc-bfbe-8e3a02deda65/lyrics_crazy_love_van_morrison_ray_charles.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_off00010763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10763 5412 bytes
SHA-256: 26015a44ecda79665db6f38e06c4bd76972b0d92fa95c1bbb8f1aa19517eb1f5
font_01_sfnt_off000119f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F7 11776 bytes
SHA-256: a7e011916edd7dbbf450fa81b7a7f02fe10539b9aef1244e29c77ad23e5c3591

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