Malicious PDF — malware analysis report

Static analysis result for SHA-256 eac00887cbdaefda…

MALICIOUS

PDF

69.0 KB Created: 2021-09-27 03:51:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f4dcd82cfc40d3d78dec074258c85f92 SHA-1: 7880cd9ce1c7e6cf584a97ea8eaa5cda6d26b361 SHA-256: eac00887cbdaefdabffd0c2c1be9d56df036a2b600bdd9ece261e8a470b43460
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF employs an image-only lure, a common phishing tactic, to entice users to click on embedded links. The heuristic 'PDF_IMAGE_LURE' indicates a screenshot-like interface designed to hide clickable actions. The presence of numerous external URIs, many hosted on disposable domains, further supports a phishing or link-farming attack pattern. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://coretry.ru/uplcv?utm_term=balancing+chemical+reactions+worksheet PDF link annotation
    • http://levne-pohary.cz/UserFiles/File/faromakavagoza.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/dalekemilexegalizewud.pdfIn PDF document text
    • https://swalaya.in/userfiles/file/sazixisipojesozed.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/b18d11fcf1d3b9cf23cc68646ed067ba/pifakejixakure.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/48185960515.pdfIn PDF document text
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/63163439110.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/70175238531.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/36845158235.pdfIn PDF document text
    • http://atomleasing.ru/media/File/dikodotilolafupikema.pdfIn PDF document text
    • http://azco.friend-match.com/upload/files/pesatidewawagebadozonixed.pdfIn PDF document text
    • https://maychieuvinh.vn/upload/files/vajokidikaripelovepalej.pdfIn PDF document text
    • http://xn--h1agcmh.com/ckfinder/userfiles/files/64611558962.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/tinujuso.pdfIn PDF document text
    • http://tweedehandswikkelaar.nl/app/webroot/files/userfiles/files/mujuninupojadu.pdfIn PDF document text
    • http://kd-council.com/upfile/files/roliwedapezujemarurosan.pdfIn PDF document text
    • https://apatity.verlauf-ekb.ru/admin/ckfinder/userfiles/files/fizuxototanokodek.pdfIn PDF document text
    • http://pizzeriagiganti.ro/imagini_ws/jeminusozovu.pdfIn PDF document text
    • https://pelletier-tp.fr/ckfinder/userfiles/files/veredonirakomatituv.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/nejalijejiwevalu.pdfIn PDF document text
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/rupogaguk.pdfIn PDF document text
    • http://biondiairsystem.it/userfiles/files/25041171990.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/e18026b45eed828e2c1272e84813b1c9/61183400037.pdfIn PDF document text
    • https://masukpt2.com/contents/files/mokikexup.pdfIn PDF document text
    • https://n-tlg.com/files/file/lodedotupuxokepawosufa.pdfIn PDF document text
    • https://kawanmto.net/contents/files/vapebitejowakat.pdfIn PDF document text
    • https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/58636151250.pdfIn PDF document text
    • https://ms01bet.net/contents/files/luzuxelojipepakapiwa.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://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_off0000b290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB290 13996 bytes
SHA-256: 00973bac7b7f4cd4d824830f45b0755c25278cfba9000d4fdbf0fcf4f96a2e6d
font_01_sfnt_off0000d4ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FF 10908 bytes
SHA-256: e112aad3c902806c2f0e59729b17d85c750ab3f6350b27795f44d115a0675724
font_02_sfnt_off0000ee2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1