Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac794284ee440e84…

MALICIOUS

PDF

74.9 KB Created: 2021-04-03 11:29:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 5a68a61a5beef3bb67bf51e954f5b239 SHA-1: 7988dc8d19a76f3f74af44e5950b368e9d184170 SHA-256: ac794284ee440e84c690c00dabcfe731890f55e83d2f394eb5f0f890047b7378
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are flagged as part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious content.

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://jacksth.ru/award?keyword=watermark+pdf+acrobat+9 PDF link annotation
    • http://reduslimitalia.site/spider_man_comicrkbpe.pdfIn PDF document text
    • http://zathkatow.xyz/free_printable_maths_worksheets_for_12_year_oldsll0zg.pdfIn PDF document text
    • https://cdn.sqhk.co/pesenexur/gAjchie/bafakazoxetogelaxib.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366377/normal_5fedcffa270e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377371/normal_6040bcbcaba07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369514/normal_604d41b64024c.pdfIn PDF document text
    • http://xuwajofona.iblogger.org/munafenitigewetib.pdfIn PDF document text
    • http://getcreditcheck.info/prentice_hall_algebra_1_textbook_answersegibj.pdfIn PDF document text
    • https://cdn.sqhk.co/baxafapunubi/bfridgi/rabasetakogataxewozid.pdfIn PDF document text
    • https://cdn.sqhk.co/jemajujo/W45X47x/golukuxana.pdfIn PDF document text
    • https://cdn.sqhk.co/rifomemi/gjTiajg/wirikivasosasige.pdfIn PDF document text
    • https://cdn.sqhk.co/xafemepino/gghg7ic/gepoxajuxelubif.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dimakuzirefew.rf.gd/tp_link_n750_login_ip.pdfIn PDF document text
    • http://mawafomixo.rf.gd/kudob.pdfIn PDF document text
    • https://s3.amazonaws.com/bubeto/egyptian_symbols_and_their_meanings.pdfIn PDF document text
    • http://jiporiri.rf.gd/pathala_bhairavi_telugu_movie_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/divelikubapiwaj/tamil_rockers_album_song_ringtone.pdfIn PDF document text
    • https://6739ca04-605d-4ff4-b4c9-4e5bd75a7819.filesusr.com/ugd/031dda_bb169ad4594c4cebbf3ce5a5e6114ae0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/safenalavojuwu/night_figurative_language_worksheet_answers_1-_13.pdfIn PDF document text
    • https://0a37a3d5-a0bf-4e77-8ff5-6127fd08aefa.filesusr.com/ugd/6046c9_a21a78cefca24b67ae9318b6f0b55e26.pdf?index=trueIn PDF document text
    • https://1ceef7f3-d523-4f80-a0a4-3aed54d3d17a.filesusr.com/ugd/48841a_643c9fb1ea9d47b3932f6cdecbed1bd2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jivamubug/sql_server_2014_msdn_evaluation_center.pdfIn PDF document text
    • http://bigerubuseke.rf.gd/pexidamuvubopivepafujo.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_off0000e738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE738 5464 bytes
SHA-256: 8de1fefe758d87e1c8aacc2e06d171ac8fbcaf3d02a1011c9340874102928697
font_01_sfnt_off0000f9c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C7 10688 bytes
SHA-256: db27df2ca34936849336f5fc095d35fac4412c87e1e273b71deb97d9c7dca89f

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