Malicious PDF — malware analysis report

Static analysis result for SHA-256 e95ad59fbbc3850c…

MALICIOUS

PDF

73.1 KB Created: 2021-10-03 16:10:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 4bafa173a812098f7f33bf22d4424988 SHA-1: e1d4712bb93c5853c43c7a1ab676d25fb96d17c9 SHA-256: e95ad59fbbc3850ca1ade4aece44edcd17520ebda480ae7204bb0551f3bf8b9d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or redirecting users to malicious content. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://crewmak.ru/uplcv?utm_term=how+to+invite+someone+on+ps4+from+xbox+minecraft PDF link annotation
    • http://bernardthevenet.fr/ckfinder/userfiles/files/zogixikevil.pdfIn PDF document text
    • http://actinq.nl/upload/file/19575172000.pdfIn PDF document text
    • http://klenderbio.com/upload/files/19867279387.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/89745070023.pdfIn PDF document text
    • https://ginniglobal.com/uploads/file/57859745338.pdfIn PDF document text
    • http://sor1310.com/userfiles/file/kivosewulusewigababavug.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/69055955386.pdfIn PDF document text
    • http://energosol.pl/images_cms/file/26016520693.pdfIn PDF document text
    • https://kermanrooz.com/img/files/38893082946.pdfIn PDF document text
    • http://gorsilawfirm.com/userfiles/file/88223325965.pdfIn PDF document text
    • https://transmilenio.net/datamont/userfiles/file/64546791962.pdfIn PDF document text
    • http://petswithlove.com/cvsprojects/SSK/Source/2.0.0/images/files/58935942078.pdfIn PDF document text
    • http://universalestetic.com/userfiles/file/1940763384.pdfIn PDF document text
    • http://dakmet.pl/upload/48520279260.pdfIn PDF document text
    • http://teakdeck.pl/files/file/39898848107.pdfIn PDF document text
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/jabexidewozupibel.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/28301646659.pdfIn PDF document text
    • http://melabo.com/upload/files/74076201153.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615143bf95694---56109859099.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/cij3n8u0ce72okc0v1mtpffma6/26994906210.pdfIn PDF document text
    • http://logopeda-empatia.pl/content/file/37468489063.pdfIn PDF document text
    • https://nergizleryapi.com/image/files/53305176855.pdfIn PDF document text
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/93448705917.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/sasuminepeluweruxemamu.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/wijumaba.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/bojitiretaronukolojur.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/54641745313.pdfIn PDF document text
    • http://shiraz.sk/ckfinder/userfiles/files/14580613625.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_off0000b8c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D5 17132 bytes
SHA-256: 54b16bbd94b5571e7699993994e055b63a721528a40e89cb5158e009d8bcd8af
font_02_sfnt_off0000fc1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1B 11060 bytes
SHA-256: 31eb6839984ce6e501b93da192a03b2430b74fd1acbd1f904d7257405d72a9df