Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf71695713f11ba3…

MALICIOUS

PDF

83.5 KB Created: 2021-09-12 08:55:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f2600288175ad1ae48634c45b4225a4d SHA-1: 0c9390697238fdd579a6945760fcf396088b2886 SHA-256: bf71695713f11ba39235a4a2085b13b7ff10c58fdcffe5ffedf4b630f6afe6f8
166 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, many of which point to disposable domains and are likely intended to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. While no scripts were directly extracted, the PDF structure and heuristic firings suggest a phishing or redirection attack, likely leveraging embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://fuzoku-kyujin.jp/ckfinder/userfiles/files/567831515.pdf In PDF document text
    • http://tko.wavedev.net/img/files/files/diwopexibemogapemizewobis.pdfIn PDF document text
    • http://jlssj.com/qianzi/upfile/case_editor/file/tekegizukokobateki.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/bexeguxopozituse.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/64708048033.pdfIn PDF document text
    • https://digiconelectronics.com/media/zefubawaveliru.pdfIn PDF document text
    • https://interior-mark.com/ckfinder/userfiles/files/bugiwewaruruwijewifexavow.pdfIn PDF document text
    • https://flomogroup.com/upload/files/senemelejoza.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16132e66eafddb---nowefasil.pdfIn PDF document text
    • http://puebloexec.com/userfiles/file/62209907950.pdfIn PDF document text
    • http://selmanoglusigorta.com/userfiles/file/pijixuguvorom.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/51207774282.pdfIn PDF document text
    • https://wilocom.ro/ckfinder/userfiles/files/3815714066.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/fewigowo.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/lomukoxojalifotilojijulob.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/99304904527.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210910150603.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/161307eb8a297e---janumaxizakoxukasotuf.pdfIn PDF document text
    • http://cortocircuito.trialpanel.com/images/Upload/files/5751099636.pdfIn PDF document text
    • https://beldapin.com/calisma2/files/uploads/48550899109.pdfIn PDF document text
    • http://cy2hand.com/userfiles/gakituxizuforonopo.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/kilafetak.pdfIn PDF document text
    • https://manage4.realtourvision.com/rtv/ckfinder/userfiles/images/files/pagenigitex.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/zizipeve.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/tobiziza.pdfIn PDF document text
    • https://gogift-it.com/userfiles/files/93521884065.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=where+are+pdf+files+stored+on+my+phonePDF 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_off0000e1e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E7 17248 bytes
SHA-256: da0570fbdfd6c323a6a44939ce5d61007a202f90bee3181f300be3cbf253f015
font_01_sfnt_off00010efc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EFC 10872 bytes
SHA-256: 2d3a39d050fb2058de4d539c519246ee0b83ca554c33708ccd14dd31d4034482
font_02_sfnt_off000127f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1