Malicious PDF — malware analysis report

Static analysis result for SHA-256 971fd194d85ad51a…

MALICIOUS

PDF

79.1 KB Created: 2021-09-11 11:56:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: e2e4c21f3d873af503fed70c008ba5af SHA-1: 3d9b2f5639d13016c2f9230365940f1306f13785 SHA-256: 971fd194d85ad51a712484f695685a74124590eb17ea7990c40ed0c563125946
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains, indicating a phishing or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • 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://anna-bel.com/app/webroot/files/userfiles/files/61071020907.pdf In PDF document text
    • http://klm-co.ru/foto/ck/files/39380461248.pdfIn PDF document text
    • http://sheilahancock.net/blogfck/file/60778595003.pdfIn PDF document text
    • http://kubablimel.pl/Image/files/66286818077.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210911_014802.pdfIn PDF document text
    • http://ondamarinarest.com/upload/files/wusiworumasuxa.pdfIn PDF document text
    • http://lukinserv.hu/file/99475209725.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/matorutixoduxizivogu.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/37699991252.pdfIn PDF document text
    • https://sklepbonus.eu/userfiles/file/4743480233.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/84338676900.pdfIn PDF document text
    • http://stillincontact.com/images/mails/file/vazipabinok.pdfIn PDF document text
    • https://upaspor.com/resimler/files/30606280740.pdfIn PDF document text
    • http://hokkaido-love87.com/app/webroot/js/ckfinder/userfiles/files/lojasasemolajajexizobokin.pdfIn PDF document text
    • https://harom.ro/files/file/82496260222.pdfIn PDF document text
    • http://sunwisechem.com/Uploadfiles/files/55940446060.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/29362884198.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/ropupifixowef.pdfIn PDF document text
    • http://tko.wavedev.net/img/files/files/motavapinerivodap.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613770bcc900c---mikunexonojeretewo.pdfIn PDF document text
    • https://powerliteaac.com/userfiles/file/56258157761.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=three+way+facetime+audioPDF link annotation
    • 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_off0000d0dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F4 10684 bytes
SHA-256: 77e83f97fddd25a70a7b02f984beee419f29428dba2a43585c2952dd6efdfb9a
font_02_sfnt_off0001018e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1018E 17784 bytes
SHA-256: f8577141b45f179f8ea26f43323f59f3d253c1b9efb501bfd8ff667f5920f8e3

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