Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dce2b34eba7c270…

MALICIOUS

PDF

84.6 KB Created: 2021-09-17 20:17:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8664d56196ee70a0f53a8a7840ba3d01 SHA-1: 8ad13f9248628f7e177bfdfb1231499beee557ca SHA-256: 5dce2b34eba7c27060db376c2b397cce87d13dfbc85e658b7883200358647d7d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of external URIs and the overall structure point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://inwebjor.ru/uplcv?utm_term=the+last+airbender+full+movie+online+free PDF link annotation
    • https://royal-art.pl/uploads/userfiles/files/88448251671.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/8084108009.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/52015383454.pdfIn PDF document text
    • https://suksesunited.com/contents/files/23404731916.pdfIn PDF document text
    • http://yuqiaohome.com/uploads/files/202109040646057157.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/99617003610.pdfIn PDF document text
    • http://riviera.az/userfiles/file/bumal.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/rutekenumonomekoj.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/161437bdd52bc5---kefitifumura.pdfIn PDF document text
    • https://wildarium.com/ckfinder/userfiles/files/643819112.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/96849727039.pdfIn PDF document text
    • http://lube-stc.com/ckfinder/userfiles/files/womelirulemamewa.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/32626449395.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16132839c16c43---kanurunifusoduvetup.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/48350136186.pdfIn PDF document text
    • https://powerliteaac.com/userfiles/file/41140685954.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/jisajozivula.pdfIn PDF document text
    • https://ibrahimkoc.com/images/Media/files/76050292535.pdfIn PDF document text
    • https://icoachyou.biz/images/ckeditor/files/wumager.pdfIn PDF document text
    • http://jszl-rolls.com/filespath/files/20210902103517.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/wabirezonibasuvives.pdfIn PDF document text
    • http://falerisztika.hu/tmp/93527885973.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/sovavumuxawidewikaguzebi.pdfIn PDF document text
    • http://www.hebrewforreadingcomprehension.com/content/ripox.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_off0000e58d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9F 17768 bytes
SHA-256: 3173509e47bfc32cc503f504060f6ac0b511783f70112d8842ee7c0e3d468f9a
font_02_sfnt_off00012bcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BCF 10888 bytes
SHA-256: 134e0a4d4562793c3b8220214b13aa9d89e3217e53bff8afc89bea5862c4b9c1