Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a37df834a8550c7…

MALICIOUS

PDF

70.3 KB Created: 2021-09-18 21:53:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e8238082b76acff0a805bd67aa1837f2 SHA-1: 84d7775b3c2e088c895d133f6d3a805b3d2e2bd7 SHA-256: 7a37df834a8550c7bb2d2eb95642c777873539fd3b3ef97dea7553d7b6bb5ea4
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The numerous external URIs, many pointing to disposable domains and employing UTM parameters, suggest a phishing or link-farming operation designed to lure users to malicious sites.

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://cructi.ru/uplcv?utm_term=load+video+from+url+android PDF link annotation
    • https://pfollowers.com/ci/userfiles/files/65347165211.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/58512805921.pdfIn PDF document text
    • https://gameadvisers.com/js/new/fckeditor/userfiles/file/japan.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/kowokamovumiwife.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/pexetal.pdfIn PDF document text
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/wofesinenejuwoka.pdfIn PDF document text
    • https://matagujrischool.com/admin/imagetemp1/file/janave.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/dajolo.pdfIn PDF document text
    • https://scalper.ir/data/files/file/40336877319.pdfIn PDF document text
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/621794605.pdfIn PDF document text
    • http://maytinhtuyenquang.com/home/maytinhtuy/domains/maytinhtuyenquang.com/public_html/images/file/fuxisivurakoz.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/52297813031.pdfIn PDF document text
    • https://ags-car.com/upload/files/14873351061.pdfIn PDF document text
    • https://akilanews.com/ckfinder/userfiles/files/lebibisodalatidunimibe.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021091308242673499.pdfIn PDF document text
    • http://meta-min.com/files/fikepivajizawusev.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0832ecdc6---37634874243.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/93542165555.pdfIn PDF document text
    • http://bippex.com/filespath/files/20210908065051.pdfIn PDF document text
    • http://gajagotour.com/UserFiles/file/berevofibuzelodamowasop.pdfIn PDF document text
    • https://888nv.ru/userfiles/file/12090958681.pdfIn PDF document text
    • http://poliinc.com/upload/files/fubefugenolefeloke.pdfIn PDF document text
    • http://lachambredechos.com/userfiles/file/78940799932.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/derunobufafexobadusekuti.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_off0000b4e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4E0 10372 bytes
SHA-256: fc25c3bf3fc7fa6f8e0bc18c9a88d93b1a4a477db5dca05a6f46a1bcc0755d76
font_01_sfnt_off0000cc3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC3C 15200 bytes
SHA-256: 706816cea7d3ef7c6d1c41e3d8f6597b1145a6673a7a592d473ebd40ebd9a2c6
font_02_sfnt_off0000f32c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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