Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff988776a864cb7d…

MALICIOUS

PDF

85.0 KB Created: 2021-03-22 18:46:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: d58717a3cf6678f492174e58a1030a11 SHA-1: b1a0cd78864da9e8fcf9f470519284ad2661b8ac SHA-256: ff988776a864cb7de6b7fc8adb3600db852c8c389a3b684641bf29ff249b642d
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://leonvi.ru/award?keyword=functional+analysis+cbt+pdf PDF link annotation
    • http://fokefetebebinin.66ghz.com/vizozokapobokomebupigamo.pdfIn PDF document text
    • https://rejurikin.weebly.com/uploads/1/3/1/0/131070637/sijuwirif-kipavubawomaw-mileb-xarolujadewolev.pdfIn PDF document text
    • https://wexubowepupewaw.weebly.com/uploads/1/3/1/8/131856394/lobaxewi.pdfIn PDF document text
    • https://gunobapeve.weebly.com/uploads/1/3/4/7/134706327/vizitigeru_futilijumuwexux_sikanonilokuku.pdfIn PDF document text
    • https://jadusulad.weebly.com/uploads/1/3/4/7/134764450/mafovomirifop.pdfIn PDF document text
    • https://sedugewevazan.weebly.com/uploads/1/3/4/2/134234752/vonatukeweri.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xijuxosisomuna/vutibeb.pdfIn PDF document text
    • http://zumemopusel.rf.gd/fonoratukuburidapujevim.pdfIn PDF document text
    • https://aee666f7-65d2-4416-8089-42e5bd85255d.filesusr.com/ugd/c4036c_6b86233c624d4007a6c57bfd5c216762.pdf?index=trueIn PDF document text
    • http://vitusaw.rf.gd/how_to_translate_with_your_camera.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/760ae13b-3c29-4fbf-9d35-936d5e011643/what_type_of_plate_boundary_does_indonesia_have.pdfIn PDF document text
    • https://s3.amazonaws.com/litunux/ariens_snowblower_shear_pin_size.pdfIn PDF document text
    • https://37e0f79d-b0c1-4727-b76d-5b759c81288f.filesusr.com/ugd/9c66ff_dffd35aba3b040dbb7ada7763697471e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfe411cf-0647-4f17-8034-b669115d3124/zejimomenenamifukuki.pdfIn PDF document text
    • https://de315c38-daa2-4293-b666-e554ba9b7d65.filesusr.com/ugd/564d2e_744a7dba1f16490b9759caba6573d9b7.pdf?index=trueIn PDF document text
    • https://9fc80a0e-b25b-4135-afeb-9811a1ea6bf8.filesusr.com/ugd/91e123_17e8769cb0e04a679ca5a5f0d612b1e4.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010f8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F8E 5248 bytes
SHA-256: 92fc3ffcb740672b12aae25e7529f30de9d0e61013ffc1819d5c702d37401349
font_01_sfnt_off00012185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12185 11056 bytes
SHA-256: ffa80042e9c505d9de527bcd52bc29cd8d8e4bafb98dffc3390aca1c88b711b6

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