Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e7e26508ec36a0c…

MALICIOUS

PDF

72.2 KB Created: 2021-03-22 20:17:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: e792531e8e6b69c4f8f6c8772ede79b5 SHA-1: d4ada480eb0cac201950af8b3811316cce6ca058 SHA-256: 4e7e26508ec36a0cc702ef400bdb30471ec74b84127ff3cd84128701a3c0648a
186 Risk Score

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 0.9997

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://leonvi.ru/strik?utm_term=should+coronavirus+pandemic+be+capitalized PDF link annotation
    • http://idealslimitalia-official.site/wordpress_blog_tutorialxhjvl.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426257/normal_5febb1db8e43b.pdfIn PDF document text
    • http://paypallsecurity.com/alibaba_apk_dlj049j.pdfIn PDF document text
    • http://olymptrade.buzz/pomona_banana_plug0z6wj.pdfIn PDF document text
    • http://espaceabonne.com/aiming_high_fce_test_2_answersft1au.pdfIn PDF document text
    • http://ulekschool.online/birds_of_prey_harley_quinn_outfitvkhyg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407070/normal_5fd3b4bc01f79.pdfIn PDF document text
    • http://movawizaxaxato.mywebcommunity.org/up_board_class_11_biology_syllabus.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://49432a94-54bc-4d13-9d12-ea41d731e1b8.filesusr.com/ugd/a7c689_e6b39a3b700d436a8db63126b4afcc68.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f24c06de-7677-44ac-80f6-73441e35d567/hmdx_rave_speaker_disassembly.pdfIn PDF document text
    • https://3176e400-c268-4dc0-8d69-08eae86937f8.filesusr.com/ugd/ea2f88_bf11b65e06ba4663982ad06f6202815b.pdf?index=trueIn PDF document text
    • https://a4758657-6aaa-4003-b0f6-1957e800abfd.filesusr.com/ugd/70c1f8_73d684f3f7914dde90c839f0621648ac.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5419fd0e-9224-4e7c-adbd-0f1448788444/asp.net_mvc_4.0_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d46ff0d-2ced-4a20-af1a-c72f3cb495d5/developmentally_appropriate_practices_textbook.pdfIn PDF document text
    • https://9334512a-4df1-45dc-8804-f0fa1d9e2a3d.filesusr.com/ugd/9466eb_f1f0590e915c4af1b206ddc854ff2404.pdf?index=trueIn PDF document text
    • https://6376acfe-5884-4251-b3d5-19a03c044549.filesusr.com/ugd/de3d83_3df2168d6282489cb992b0b0e08c6547.pdf?index=trueIn PDF document text
    • https://6cdf8c5e-36a0-4b6d-987f-32d3d50030cd.filesusr.com/ugd/3c2e2e_a6e54b0f8fa3473da1a79a92bca80ff6.pdf?index=trueIn PDF document text
    • https://24451074-f53b-4065-993c-779ba3957988.filesusr.com/ugd/0ae25f_5a0d757243b24da89fff29a4d5410bc4.pdf?index=trueIn PDF document text
    • http://nemenarubaz.atwebpages.com/cantine_scolaire_en_cte_d_ivoire.pdfIn PDF document text
    • https://f2d828cf-06d9-46ea-85af-d88b0bc20d44.filesusr.com/ugd/501a20_8122e44303464c868fd52003e667fa97.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbc57c02-63b1-4ef4-925a-6857e2b0128d/momoxugenugogunuzuvefonos.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_off0000dc40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC40 5668 bytes
SHA-256: 89b33cdb56755fa94b0d2ad5f83da7374eb0096b96d2ccc99c587334934828a7
font_01_sfnt_off0000ef62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF62 10608 bytes
SHA-256: efed82cfc47d14e0ddee62d9b3f422322239517e76d5eb570db7f2b07fb3b4f7