Malicious PDF — malware analysis report

Static analysis result for SHA-256 a20d9d08266bf00a…

MALICIOUS

PDF

84.2 KB Created: 2021-09-15 18:14:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dd7d215b54b34ea2e343c9d50ee7f409 SHA-1: e06694b3469253b3ca0e41f8b6111825b1f8527e SHA-256: a20d9d08266bf00a8fc15ed8d98ec797e35790fed3098f424a6fd3215d1536d8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains embedded JavaScript, indicated by the PDF_JAVASCRIPT heuristic, which is a common technique for downloading and executing further malicious content. The presence of numerous external URIs, many of which point to potentially compromised or disposable domains, further supports the malicious intent, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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 http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130cd81ac00d---37565113264.pdf In PDF document text
    • https://virker-ikke.dk/files/43382621655.pdfIn PDF document text
    • http://infunplastic.com/d/files/julelogogonejowa.pdfIn PDF document text
    • http://abarappresentanze.it/userfiles/files/lisexezarurovugatap.pdfIn PDF document text
    • https://libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/penexagolirijetabuli.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/90176351239.pdfIn PDF document text
    • http://preiss.at/upload_files/files/6942913445.pdfIn PDF document text
    • https://tinhhoaxanh.vn/userfiles/file/32983540904.pdfIn PDF document text
    • https://shreegroupco.com/userfiles/file/zapivofosetadirakilare.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/denegebona.pdfIn PDF document text
    • https://szelvedojavitasmiskolc.hu/files/files/robipivi.pdfIn PDF document text
    • http://frankslawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tikepu.pdfIn PDF document text
    • http://local-minicab.com/survey/userfiles/files/xumuvemutaba.pdfIn PDF document text
    • http://tgroupsrl.com/userfiles/files/84492997597.pdfIn PDF document text
    • https://enilubricantvn.hoakhanh.vn/uploads/image/files/71632402398.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/gelop.pdfIn PDF document text
    • http://ekogamma.pl/javascript/ckfinder/userfiles/files/14650209846.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/43531223724.pdfIn PDF document text
    • http://royalgroup.at/tmp/finopamuputazizi.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/89926232573.pdfIn PDF document text
    • https://cnn-logistics.com/asset/files/64477123086.pdfIn PDF document text
    • http://nature-revive.org/files/file/filujodonug.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents/files/75946279454.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=beautiful+words+that+start+with+bPDF 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_off0000e632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE632 17040 bytes
SHA-256: 768e42c6d929a7c6fd21a89f6b3301bb2157fa4da8ca4344a8fae69652d0ff8f
font_01_sfnt_off0001120c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1120C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A23 10724 bytes
SHA-256: a289df948a0b86203969745e706e906219299b6566dd2d6b10d85cd88d9d883a

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