Malicious PDF — malware analysis report

Static analysis result for SHA-256 63abd86cd6563971…

MALICIOUS

PDF

93.7 KB Created: 2021-09-17 21:00:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 59568c9429e1db87cdabcc81f3a2b7c8 SHA-1: ae49f51deb5eaf35f17ee78b37381cafe3a8a1f0 SHA-256: 63abd86cd65639711868179b8ea9df1eb41d23be77d755efde762457bae75a7b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous embedded URLs, many of which point to disposable domains or link farms, suggesting a tactic to obscure the final malicious destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights this behavior, indicating a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

Heuristics 5

  • 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.
  • 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=after+movie+complete+in+english PDF link annotation
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd11dc0aca---21233736525.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/12756453981.pdfIn PDF document text
    • http://euroear.eu/ckfinder/userfiles/files/72460309368.pdfIn PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/36911374426.pdfIn PDF document text
    • http://purepoem.com/resource/docContentImg/file/2021-09-05/6ae7d901a7c29c1bce0ed36466c1a30a.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/161307ef2be0b7---49551213654.pdfIn PDF document text
    • https://aquarell.ro/userfiles/file/pupaneginunudegutikiguxa.pdfIn PDF document text
    • https://okazionche.com/files/7888084729.pdfIn PDF document text
    • http://yuhao-tech.com/userfiles/file/nuwenola.pdfIn PDF document text
    • https://saunadlaciebie.pl/userfiles/file/pamoniwamazitetab.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/rapivenufize.pdfIn PDF document text
    • https://beautydiction.com/ckfinder/userfiles/files/93383900464.pdfIn PDF document text
    • http://kartelabasligi.com/images_upload/files/86035984081.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/sugekogiwaturazos.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/56352060649.pdfIn PDF document text
    • http://kammatrans.com/userfiles/files/53888455757.pdfIn PDF document text
    • http://studioaeditecne.it/userfiles/file/pinamubukupisu.pdfIn PDF document text
    • https://rubfila.in/files/file/vulitoxip.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/78940239088.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/58462662744.pdfIn PDF document text
    • http://munnartourism.com/uploads/file/sepapo.pdfIn PDF document text
    • http://xmzhj.com/UserFiles/file/kumiwafafepif.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/fikivenuzepuganawod.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/26948590942.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/jusemigun.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/80683635042.pdfIn PDF document text
    • https://bc2000.order-pro.com/ckfinder/userfiles/files/82814569563.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_off00010aed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12304 10812 bytes
SHA-256: 2c2e4034538a3a76cee9649723efbe89872e19f68f530ea73eaefb19eaa056d6
font_02_sfnt_off00013bc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BC6 17336 bytes
SHA-256: d373b802d2cf395b7e9d41560f75cf941f899fcf9fe110a41ea79aaabe9c5bf1