Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b4349966e1b92e4…

MALICIOUS

PDF

85.6 KB Created: 2021-03-19 18:19:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 488e231f15d8682af7eeab69f1ad9704 SHA-1: 1f9be64c6d43388f3ea4bc9d72d589c5ef46ef18 SHA-256: 9b4349966e1b92e45be64a143d88f3573ce45528a6e097786edf18b076760496
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 5

  • 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 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://resalured.ru/123?utm_term=canard+pc+hors+serie+24+pdf PDF link annotation
    • http://freshmind.net/popuzodufasopoteja50jwa.pdfIn PDF document text
    • http://begetus11ppz.xyz/josufewukabquel.pdfIn PDF document text
    • http://curvepreloved.com/bitlife_latest_update_apk2nejp.pdfIn PDF document text
    • http://titanof-filtr.ru/dell_optiplex_780_audio_drivers_download_for_windows_10psr2t.pdfIn PDF document text
    • https://cdn.sqhk.co/wedegetuso/biaWegf/60238234704.pdfIn PDF document text
    • http://idealslimitalia-official.site/demographic_profile_of_pakistan_2017ekojo.pdfIn PDF document text
    • http://hhizmet.com/410224258423xaz1.pdfIn PDF document text
    • https://cdn.sqhk.co/noxawuge/hajfWYY/things_you_can_talk_about_yourself.pdfIn PDF document text
    • https://cdn.sqhk.co/guledijuxi/cidjhjb/all_cruise_ship_stock_prices.pdfIn PDF document text
    • http://legiontry.online/84887494658mvwdu.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/c09504ab-4f75-4ab3-a2b3-e33e071b963f/java_swing_timer_example.pdfIn PDF document text
    • https://6e7ef639-f89a-4701-86f9-710a836f1183.filesusr.com/ugd/12745a_65f3f759f45443a88b6f9d6e61fbfc72.pdf?index=trueIn PDF document text
    • https://e192e36c-395d-4660-9df6-aa7aed00c30a.filesusr.com/ugd/3aee12_2fb20c46f54b4823aa85b61b092381a7.pdf?index=trueIn PDF document text
    • https://cb6d8354-940b-4e05-9f1d-0150973ab277.filesusr.com/ugd/882da0_d9a2d6eae25e4188ae5a7af75406a289.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c155dcd-16c4-4d55-8bfc-ec6fba55daf1/97967259287.pdfIn PDF document text
    • https://43dda2ad-fadc-418c-a2d5-4b96cca2ed60.filesusr.com/ugd/6eca9c_482b3b0d0d294cb482e7b40b2b261acb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef884379-10a1-42da-9074-cb94d13cb216/18252048736.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb8f49c0-1f88-4bdb-971c-737f731562c4/93747151215.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/610c0c0c-e212-4d7c-9c76-d531a4090d82/difference_between_gdp_and_national_income.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_off000109ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109ED 5336 bytes
SHA-256: d3f56bc0feffb72a43c54d4ddda6f5e3549c8649a1baca673cce4719d8140f3a
font_01_sfnt_off00011c14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C14 14184 bytes
SHA-256: ad2d7e3faf68bd2bfa51113c507c572fed895822d7cd5679c7ee72f3d728ff90

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