Malicious PDF — malware analysis report

Static analysis result for SHA-256 372c9d6420862d58…

MALICIOUS

PDF

84.4 KB Created: 2021-09-21 13:21:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b088416d9f387425f749b1a8e0a66c95 SHA-1: 52c42b446bd1133ae9941fbc20157ae554c964b2 SHA-256: 372c9d6420862d58a87e311e44c836aa891903603585b383d8201afbf604e4ca
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a malicious PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features numerous links to external PDF files hosted on various domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the exploitation of PDF vulnerabilities to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://firsatpin.com/calisma2/files/uploads/meneru.pdf In PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/file/34492239975.pdfIn PDF document text
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/76042608244.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pemafodi.pdfIn PDF document text
    • http://myucpb.com/userfiles/file/zupedowamirowatiz.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/19211072120.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/92499146894.pdfIn PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20210916_B21C31DD43D35A67.pdfIn PDF document text
    • http://www.plain-pied.com/editeur/ckfinder/userfiles/files/lopomexexenebubi.pdfIn PDF document text
    • http://aajude.pt/backoffice/ckfinder/userfiles/files/kifagetexomon.pdfIn PDF document text
    • http://studiomedicoveterinariobellucci.eu/userfiles/files/39812210520.pdfIn PDF document text
    • http://domingo.hu/ckfinder/userfiles/files/wikigubodelagupo.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/55589852641.pdfIn PDF document text
    • https://dom4m.lv/userfiles/files/33248461229.pdfIn PDF document text
    • https://matraci.info/UserFiles/File/xuwupatulor.pdfIn PDF document text
    • http://grandfiltr.com/files/file/kikinogijaxedutikal.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/d30356f8c90f6919d2df34c1ec4dbc9f/65143435876.pdfIn PDF document text
    • http://www.thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/72436062209.pdfIn PDF document text
    • https://tl-systems.hu/files/files/57816900357.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138000210ec9---fesisanomufeveje.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/jukoxeresikukodipizewo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=download+ganool+movie+apkPDF 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_off0000e71c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF33 10616 bytes
SHA-256: 31be48f8e351432ea96ea461411206446c2270cc618a9390bf77630d1d688bfb
font_02_sfnt_off00011731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11731 17240 bytes
SHA-256: c281e72ebb33212c120a497e2a9e7828b26ee4c4e4ac735841694dac57585a5f

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