Malicious PDF — malware analysis report

Static analysis result for SHA-256 71f6cd0b3e67fb15…

MALICIOUS

PDF

71.6 KB Created: 2021-05-07 10:16:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e32618483c68b0a6af8fbb6426a140ce SHA-1: eaf6ad0c895f10093d78a046c01e19539a892737 SHA-256: 71f6cd0b3e67fb15cec66121283c44081899890c898f8a5311dc324eca678277
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 0.9991

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://bologen.ru/strik?utm_term=arihant+english+grammar+book+pdf+free+download+in+hindi PDF link annotation
    • https://cdn.sqhk.co/nilamemiw/S5gdgfq/39433436971.pdfIn PDF document text
    • https://cdn.sqhk.co/ravawiku/ifiavoq/tech_news_application_app.pdfIn PDF document text
    • https://cdn.sqhk.co/tisufupujeli/dNieAAC/zizadikoxadodexekurop.pdfIn PDF document text
    • https://vatopefo.weebly.com/uploads/1/3/1/3/131398509/0aa56e81a9.pdfIn PDF document text
    • https://cdn.sqhk.co/jugokake/wBihgEA/ghost_ella_henderson_sheet_music_free.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxofabope/ig9Igj7/minecraft_chernobyl_map_1._7._10_download.pdfIn PDF document text
    • https://cdn.sqhk.co/nupumusu/iiogjGo/73321476621.pdfIn PDF document text
    • https://bepupoxusiboma.weebly.com/uploads/1/3/4/8/134847186/8430132.pdfIn PDF document text
    • https://cdn.sqhk.co/jufebarur/e7hbhgs/the_7th_continent_walkthrough.pdfIn PDF document text
    • https://cdn.sqhk.co/pigalixow/dhfswVm/68870401807.pdfIn PDF document text
    • https://zosujugopaw.weebly.com/uploads/1/3/4/5/134509911/9934391.pdfIn PDF document text
    • https://pigebatidi.weebly.com/uploads/1/3/1/4/131482999/879531.pdfIn PDF document text
    • https://bofakodejo.weebly.com/uploads/1/3/4/2/134265658/zepupexopazapiw_vuzexikomafu_sedesixolegeku_jumasivopipub.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f45985d3-969e-4a4b-a16b-f92b7c881388.filesusr.com/ugd/20da2d_21bc0653c8fe4759aec94b536cb12d9d.pdf?index=trueIn PDF document text
    • https://486a928f-df87-4682-b39c-9199637d78f9.filesusr.com/ugd/982a49_3c65c3fcfa904b408a2b0970be9d7b71.pdf?index=trueIn PDF document text
    • https://24451074-f53b-4065-993c-779ba3957988.filesusr.com/ugd/0ae25f_33346a4754a94a6fa44fe27187b84a9d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zasepo/petsafe_wireless_fence_pet_containment_system.pdfIn PDF document text
    • https://a7da3e60-63c8-46c1-a846-eab7df628ed2.filesusr.com/ugd/bba345_dcb33b7c63714758acc8f6979f19be26.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jamuluvuvava/kanederad.pdfIn PDF document text
    • https://748e6e98-33e2-4bd1-95aa-01ea3505a154.filesusr.com/ugd/704f6c_845a3e38f602403ea3106e4bb9f0f7d6.pdf?index=trueIn PDF document text
    • https://cf62593c-3f62-494e-9ef9-3c2a63ead7d7.filesusr.com/ugd/93dae2_815d5289c538446d8086e619be0507ba.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pusolefosex/gulop.pdfIn PDF document text
    • https://7e005a1c-fb68-43c1-af83-b854b6a2d282.filesusr.com/ugd/dcfb95_c4c50a1d46c84381a7f37ef32e61de9a.pdf?index=trueIn PDF document text
    • https://ddb281da-11d2-423e-b83a-408ecf1f607f.filesusr.com/ugd/9db61c_419e9d3d782b42729c5f05f30e6a50bc.pdf?index=trueIn 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_off0000d572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD572 5740 bytes
SHA-256: 18306362d08f7b0db8e716724608b469160a77b41162976685b91d417025b07e
font_01_sfnt_off0000e8e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E1 11084 bytes
SHA-256: 7c8bba022d415ea9de619c165e718c3ec9c73fe46155beac160e4b24bae80f0c