Malicious PDF — malware analysis report

Static analysis result for SHA-256 78e81c50ed858e54…

MALICIOUS

PDF

89.4 KB Created: 2021-09-15 14:59:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cb8d7a336c97627ac44ef1bad6c69f93 SHA-1: a0f07731991efa599a1e6c3a91dc61bb1af2f98a SHA-256: 78e81c50ed858e54f5d803c73041800525e17116227b721006f7b3623f6f6e8e
134 Risk Score

Malware Insights

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

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also functions as a link farm, directing users to numerous external URLs, many of which are hosted on disposable domains. This suggests a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://archism.ru/uplcv?utm_term=black+market+apk+2019+download PDF link annotation
    • http://www.naturhalles.fr/fckeditor/userfiles/file/21208981044.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613762cd6141d---nolekokemovile.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/57501899620.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210907000429496.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/89511676575.pdfIn PDF document text
    • http://boletin.alicantehosteleria.com/lib/ckfinder/userfiles/files/dijejijeluribuk.pdfIn PDF document text
    • https://md-bud.pl/szklo/photos/file/18789148534.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/20113628119.pdfIn PDF document text
    • https://kvzriu.org/images/file/8602767602.pdfIn PDF document text
    • http://leasingtowers.com/ckfinder/userfiles/files/sorixidoguburepapiwijifis.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/jadibulij.pdfIn PDF document text
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/mepitivas.pdfIn PDF document text
    • http://youzedu.com/ckimages/files/20210905223350557772.pdfIn PDF document text
    • http://fluorescent-training.com/file/tizusawexewemad.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/95270910165.pdfIn PDF document text
    • http://faithleader.org/js/ckfinder/userfiles/files/7460289008.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/madimuwusijakoforakapo.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/80735374137.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/poberafokibosox.pdfIn PDF document text
    • http://kietminhrivet.com/upload/files/78412606332.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/60448184665.pdfIn PDF document text
    • https://kildevangen.dk/files/26398923415.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-9-12/20210912223300799064.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/dolipakoxinirapufux.pdfIn PDF document text
    • http://dtmaso.com/public_html/Imagens/file/nuposigigugusilafudiworaj.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/48364192542.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_off0000f6a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC0 11108 bytes
SHA-256: 119d8a338b034bccd14b1063c334063e4f3d31ce8ac774336e1ed518bb1f17f8
font_02_sfnt_off000128c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C9 18088 bytes
SHA-256: fc42444e05cd267fba0cfcac81487670a7f3b11508454e9bce5b98006670a632