Malicious PDF — malware analysis report

Static analysis result for SHA-256 025508fd9e6d638a…

MALICIOUS

PDF

84.2 KB Created: 2021-04-02 16:11:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 4e386710352edafdb7e6ea643b02fd27 SHA-1: 8a789c9aacf2ebc05db8931c716f473f4a766f95 SHA-256: 025508fd9e6d638a8246cc68c05f3d7da1d3a331064c1aec67dc110bb8667c4e
166 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a fake browser/software-install lure. 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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://seumenha.ru/award?keyword=lorentz+half+shade+polarimeter+pdf PDF link annotation
    • http://rikororasikenek.iblogger.org/zamivelukuferuruv.pdfIn PDF document text
    • http://worelimupuvefam.mywebcommunity.org/two_wolves_story_billy_graham.pdfIn PDF document text
    • https://rirudelibuwa.weebly.com/uploads/1/3/1/6/131606594/c1a8b5f138.pdfIn PDF document text
    • http://zovopoxojun.iblogger.org/10th_new_english_guide.pdfIn PDF document text
    • https://raxazejopife.weebly.com/uploads/1/3/5/3/135313527/wuvola.pdfIn PDF document text
    • http://rowaxamapitowej.getenjoyment.net/64389768735.pdfIn PDF document text
    • https://towizitubozabo.weebly.com/uploads/1/3/5/4/135400713/5c71b326.pdfIn PDF document text
    • http://zivemigidefis.mypressonline.com/70832329132.pdfIn PDF document text
    • http://tujemet.scienceontheweb.net/bruce_lee_movies_on_hulu.pdfIn PDF document text
    • https://ginamorevuj.weebly.com/uploads/1/3/4/3/134392530/2386310.pdfIn PDF document text
    • https://borerejo.weebly.com/uploads/1/3/4/0/134040615/niragetusoxifu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7696c86-57f0-489e-80d2-ff33952ea05c/rv_furnace_troubleshooting_hydro_flame.pdfIn PDF document text
    • http://zinimivozu.rf.gd/forgotten_realms_books_amazon.pdfIn PDF document text
    • http://dereduvate.epizy.com/zikuxapesituguke.pdfIn PDF document text
    • http://tuminexozuvino.atwebpages.com/79778553209.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bcd552f-368c-43e2-90a3-c66d0223ced3/lifetime_32_youth_portable_basketball_system_assembly.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_off00010747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10747 5272 bytes
SHA-256: 691d3c5bfda3cc76535d4edcd5deee765865d7005771c668d63a2c6f548fe41f
font_01_sfnt_off00011915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11915 12376 bytes
SHA-256: 4179df8bcbfad3fb78170be7f905c87e397511ad03bf178b19df3a8fc6e88871

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