Malicious PDF — malware analysis report

Static analysis result for SHA-256 13e285517ffe5aaa…

MALICIOUS

PDF

83.3 KB Created: 2021-10-21 19:03:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 6907b10ab143d3d6285fb39ca33db7b4 SHA-1: 3d357aeed41e56fc28461d2fdff6b2f04c5fa635 SHA-256: 13e285517ffe5aaafe6d7a1878b8c5a8570edca7ba87112e7332882583664862
166 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with several heuristics flagging it as a link farm on disposable hosting and pointing to algorithmically-generated URLs. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were extracted, the structure and URL patterns suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://ibtaker.ps/userfiles/file/79121433411.pdf In PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/zusori.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/41856785057.pdfIn PDF document text
    • https://moolans.com/uploads/files/mazebexefosi.pdfIn PDF document text
    • http://radiopoint.cz/userfiles/file/pinibediwopopuvaremu.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/3138630394.pdfIn PDF document text
    • http://sinching.com/uploadpic/files/202109190717108139.pdfIn PDF document text
    • https://tumujerrusa.com/userfiles/58646440870.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/morowuvukefobebug.pdfIn PDF document text
    • https://askflip.com/uploads/files/8379392966.pdfIn PDF document text
    • http://lactopad.com/uploads/files/vilaxotezodigufomok.pdfIn PDF document text
    • https://serviceelectric.ca/userfiles/file/losopedavonimelisiko.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/qgnja3q3nre2p6nenaebeda422/58075821554.pdfIn PDF document text
    • https://neelamihouse.com/userfiles/file/71275697093.pdfIn PDF document text
    • https://enilubricant.hoakhanh.vn/uploads/image/files/51761106482.pdfIn PDF document text
    • https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/24119173875.pdfIn PDF document text
    • http://herve-coiffure.ci/files/lebolomojibe.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/5639824287.pdfIn PDF document text
    • https://keyword-lda.pt/site/upload/file/31413129913.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/31464302059.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/tixegeme.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/90617404001.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/wezunukazubepuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/1hHberoKktI/uplcv?utm_term=powerful+spell+in+harry+potterPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e08f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08F 10756 bytes
SHA-256: 38c35cafcd6ec24e99362a088dcc3195ac6ddeec25c85de82cdf776b379e1197
font_01_sfnt_off0000f95b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95B 17884 bytes
SHA-256: 298a7d530f32e844676ee48d27cb394812e4185eb5ca57ed40faddcd7eeb9832
font_02_sfnt_off00012768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12768 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1