Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f5985e09c5ce308…

MALICIOUS

PDF

73.2 KB Created: 2021-09-14 15:12:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 8b59740153e0eb2a1d8349dcad754fb0 SHA-1: 2509083ab016b0eff77c6cec091f0f1ac8415d77 SHA-256: 5f5985e09c5ce308317fe3b2a94e76b3f5893b08df444a9abdfd5360ed5dadf3
134 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external links, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crewmak.ru/uplcv?utm_term=score+hero+mod+energy PDF link annotation
    • http://neo-net.info/giganet/files/file/ratukurojijugoni.pdfIn PDF document text
    • https://parisnordmedical.fr/docs/file/lezitimoxuni.pdfIn PDF document text
    • http://gocchame.vn/app/webroot/img/uploads/files/tobivovenuzugedulenamu.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/161394e4d73887---44105759883.pdfIn PDF document text
    • http://ndc-group.ru/uploads/files/56875313038.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/26272703405.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/86045785589.pdfIn PDF document text
    • http://seatraderhk.com/userfiles/16422704759.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210904043535.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/95764465005.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/65696787699.pdfIn PDF document text
    • http://aaas.handyfriendship.com/upload/files/zavexoguwomurowidofun.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/dizamiriloferudivobe.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/10837110706.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/nosafinifofu.pdfIn PDF document text
    • http://ydis.kr/userfiles/file/131950368259.pdfIn PDF document text
    • https://swiz.eu/files/editor/pitiva.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/19995198612.pdfIn PDF document text
    • https://kalitelivideoizle.com/resimler/files/1180905682.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/73797994996.pdfIn PDF document text
    • http://daltan.hu/userfiles/file/zisilexuwalebakamiba.pdfIn PDF document text
    • http://trust-law-firm.com/userfiles/file/20210901070658_1386846555.pdfIn PDF document text
    • http://folientastaturen.pl/_data/file/wuzogepojimaxub.pdfIn PDF document text
    • http://erbamedica.org/userfiles/files/7597688023.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_off0000bc6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC6D 17116 bytes
SHA-256: 1da54f88b76bd7283157ac0212d780b2b57c818e36eaf1cca9cde27eebc65410
font_01_sfnt_off0000e857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE857 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001006e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006E 10440 bytes
SHA-256: d4fb0f207b0548e0727d4865927226c1fecd56ddcb72a4a48516cf4b5e21cde1