Malicious PDF — malware analysis report

Static analysis result for SHA-256 798521af4746cea9…

MALICIOUS

PDF

83.7 KB Created: 2021-09-18 04:29:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f28858f3c9ae91aaa22829bf9834c91e SHA-1: ae3b745fe15135c8031420f0a53fef1796ea4ef6 SHA-256: 798521af4746cea92735fc3986ba7c7eb293d04f834431f4c932118abc4e1145
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and numerous external URIs, flagged by heuristics as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • 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://coretry.ru/uplcv?utm_term=free+guy+watch+online+movie PDF link annotation
    • https://jungleflightchiangmai.jungle-flight.com/Uploads/files/bolakuxugikakufu.pdfIn PDF document text
    • http://ameshamagazine.com/js/upload/files/27158918385.pdfIn PDF document text
    • https://kuraniterbiye.com/resimler/files/91133617904.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/54597531727.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/bisugemunetipugegemez.pdfIn PDF document text
    • http://stmarysharipad.com/userfiles/file/sosadaletavim.pdfIn PDF document text
    • http://movitecnic.fr/ressource/site-image/files/fanoxudijigokaditalavota.pdfIn PDF document text
    • http://tvtamminhphat.com/uploads/userfiles/file/lopepizuvabofevapozoda.pdfIn PDF document text
    • http://sor1310.com/userfiles/file/poguto.pdfIn PDF document text
    • https://bhopalliteraturefestival.com/mpsdp/uploads/files/fafanibinigusadisajuguxol.pdfIn PDF document text
    • https://elger.cz/fckphotos/file/vunakijunikoxexev.pdfIn PDF document text
    • http://th-hl.com///upload/files/5150065541.pdfIn PDF document text
    • http://itagqatar.zajeltel.com/itag/file/files/venuxutafegemigozajare.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/bac5f363eeb0146bc089896de23b275c/figetisodebidovef.pdfIn PDF document text
    • https://sentinels.ro/userfiles/file/38646260758.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa3dbaf789---43364032343.pdfIn PDF document text
    • http://levant-tekstil.com/other_files/File/8837088468.pdfIn PDF document text
    • http://artanuji.ge/admin/ckeditor/ckfinder/userfiles/files/6253075091.pdfIn PDF document text
    • http://mcserpenti.com/userfiles/file/borurog.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/xumadipazubidi.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210907091549.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zadeposetofodim.pdfIn PDF document text
    • https://viceda.com/userfiles/file/karovuvos.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_off0000e046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE046 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF858 18640 bytes
SHA-256: e95d80c2d99f6fce07acb485a70405bfdc9159eba2b2c586edb70b93fd6db716
font_02_sfnt_off00012835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12835 10852 bytes
SHA-256: eb895889835e369ab879f56c3e258b22a4da762f991286e4b2ed66068deab3b2