Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e7e81864259ca10…

MALICIOUS

PDF

88.2 KB Created: 2021-03-15 21:52:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 2ada76ce3b760892137278690db149c6 SHA-1: 57e46cbfb3ac9a55fe43e12bc354ec9832ef7aee SHA-256: 9e7e81864259ca1025267739280651c74535fa9a764dd8a6ec57ba12aa4f8452
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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://botokaw.ru/aws?utm_term=what+is+god%2527s+comfort PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e8e87dc5-637d-47ba-9de6-e7d98d123d78.filesusr.com/ugd/a69a03_2db4d2721fc44ba9867861600e917a74.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/71a9ae8a-06c4-4a3a-bb28-ef342c805d27/74567147348.pdfIn PDF document text
    • https://1628ddcf-e301-416d-9649-d9339b85441b.filesusr.com/ugd/0b1079_33aa6d6101fb4c05a7ae41e1ce28a8bf.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bezegoluzose/buzulozisidoxaliwomemedo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2af1e29-7e08-4ecf-8b93-89199bc6163c/blue_is_the_warmest_color_movie_watch.pdfIn PDF document text
    • https://35e1cc1d-5f6c-4a41-9b1b-b9ae8dddc97a.filesusr.com/ugd/351eee_bb6c52a226d14454a80cefd31b8b9cae.pdf?index=trueIn PDF document text
    • https://eb62986f-0112-409a-9ebe-777412bc5c19.filesusr.com/ugd/26938b_ce0989e2b4e74b71a2be8fa12ec46967.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cfc11ac-4dc5-4039-9603-4c600c507745/velasaxaxopurolaxon.pdfIn PDF document text
    • https://f87ce62f-3d5d-4c42-bff3-2e7d00444551.filesusr.com/ugd/72ed28_450696e919b640a799748d27046d78ee.pdf?index=trueIn PDF document text
    • https://4bf641bf-117a-4913-931f-55e49063997f.filesusr.com/ugd/5befcb_636920f08f69419f9177c32627c56ece.pdf?index=trueIn PDF document text
    • https://878ee1be-828d-48b9-a24a-84283cf66a1c.filesusr.com/ugd/86936c_9ce41879a14941d4be855fa5ca8d61ee.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac408c69-d922-4b73-b706-baec20d68352/mba_operations_management_salary_in_dubai.pdfIn PDF document text
    • https://0a3c8164-ddd9-4522-8472-457ce31ece15.filesusr.com/ugd/d32f78_eb6633512c084b2dac2cf5159b8dc6bf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a56f847-35a5-4ad9-b8a4-6546df2f326f/batimutija.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7429fb37-7f1f-43ec-aa4f-2398894c6b85/99081010806.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45661797-2360-477c-a271-b25497294fc7/gagomeli.pdfIn PDF document text
    • https://s3.amazonaws.com/xelimewat/jixek.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_off00011c72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C72 5452 bytes
SHA-256: 208d4f32c4d1834331b6d784ff8c73b24bf6067b91adf50510304f2fcd3c9fde
font_01_sfnt_off00012ee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE2 10800 bytes
SHA-256: b75160cad573264b4c4f853b8fb45ffcb8bbd11a89d9eef8bb63e2cf210314ca

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