Malicious PDF — malware analysis report

Static analysis result for SHA-256 946f9b57f3e49ab4…

MALICIOUS

PDF

75.9 KB Created: 2021-05-07 07:52:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 74bcee7e8a05f8e1610f401c5cd1d5a7 SHA-1: 8e31443e4d9a4a69846fb9aa31b4f8f79b440af6 SHA-256: 946f9b57f3e49ab49db1bda8091bc96d2ab2da1f2da74af9d326a8ac1cb86b24
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 0.9993

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://kuzutuzo.ru/strik?utm_term=healthy+things+to+eat+at+burger+king PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417321/normal_5fd2848d3b47c.pdfIn PDF document text
    • http://rimiripa.mypressonline.com/61663641817.pdfIn PDF document text
    • http://xanusojuruxu.sportsontheweb.net/87834584757.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452395/normal_604e9235a8374.pdfIn PDF document text
    • http://pakekoramiduwin.getenjoyment.net/opposing_viewpoints_series.pdfIn PDF document text
    • https://cdn.sqhk.co/fekigimuzib/djhAEhg/monkey_king_movie_jackie_chan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365628/normal_5fe6c761c9921.pdfIn PDF document text
    • https://cdn.sqhk.co/pamomusemida/jghgN8r/7023373986.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370077/normal_60120bffcb0b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367911/normal_604634c4794b7.pdfIn PDF document text
    • http://zusiwibewire.mypressonline.com/52402525762.pdfIn PDF document text
    • http://rejasikega.scienceontheweb.net/60428616758.pdfIn PDF document text
    • https://cdn.sqhk.co/zovitamojim/6nlXV9F/52275286429.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/fc876c3a-0220-4134-b257-3dff62e87218/did_i_ever_tell_you_how_lucky_you_are_quotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a3491ff-8f6f-4a98-bb46-239516d9d5f7/vekixawa.pdfIn PDF document text
    • http://fonumelipo.rf.gd/bose_acoustimass_10_series_iii_setup.pdfIn PDF document text
    • https://s3.amazonaws.com/jujadodedaruxix/4768830594.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03afda37-76bd-4817-9565-ed2844a9d9cd/how_to_summation_in_excel_formula.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/700c34d4-9ad8-4b66-ba44-aeb28b79685d/is_the_2017_nissan_murano_reliable.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5296a3f9-e2df-4024-8efe-1a75682dc9b7/59531724281.pdfIn PDF document text
    • http://xanobokapi.rf.gd/55467289782.pdfIn PDF document text
    • http://pepiretivixu.epizy.com/dizebigod.pdfIn PDF document text
    • https://s3.amazonaws.com/biwuwukesazef/college_algebra_with_trigonometry_barnett.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_off0000e83a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83A 5212 bytes
SHA-256: 2b2d047d9cd7e8afde7fe13c2c1073a94449e1248ce57c6c508e3f81c9f58a5d
font_01_sfnt_off0000f9f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F5 11332 bytes
SHA-256: 9913b7b389eea0b4a90f1c1abe50e640f0129a05f0d32d4d360137ce7478d066

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