Malicious PDF — malware analysis report

Static analysis result for SHA-256 c289bc134e0c5278…

MALICIOUS

PDF

69.9 KB Created: 2021-09-25 09:49:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8879f8791d05225891b694af8f855e1e SHA-1: 7a033bcdc04a789b26b39f9f3d93f220b833a691 SHA-256: c289bc134e0c5278ddf5de931dd6e7053c61f71f576a9e51bc041b95e772199e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting and are part of a link farm. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to redirect the user to phishing or malware-hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://smidgel.ru/uplcv?utm_term=hd+live+cricket+app+download PDF link annotation
    • http://apple888.vn/luutru/files/22341485895.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/89842024318.pdfIn PDF document text
    • https://cytokin.ca/upload/editor/file/noradevat.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/32179064304.pdfIn PDF document text
    • https://satbietthu.com/luutru/files/donulibup.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/46211163378.pdfIn PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/pajuremuvikajimufojeb.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/nozujabawatikabinibejom.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/rurar.pdfIn PDF document text
    • https://rumputhijau.com/contents/files/18414501652.pdfIn PDF document text
    • https://studiopros.com/userfiles/file/In PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/xirin.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/95447674474.pdfIn PDF document text
    • http://855solution.com/htdocs/cljr/data/files/wabanonejoveriwosu.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/gukikelivarade.pdfIn PDF document text
    • http://rtm-plus.ru/ckfinder/userfiles/files/7140688186.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/fedetenenamoxix.pdfIn PDF document text
    • http://hkwwta.org/userfiles/96244860710.pdfIn PDF document text
    • http://k-ookuma.com/js/upload/files/voxamorubaritijawukigok.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/42482065039.pdfIn PDF document text
    • https://spotiverify.com/ci/userfiles/files/suxasatigigovanurusiga.pdfIn PDF document text
    • https://jnnjhansi.com/userfiles/file/62769235261.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_off0000afab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7BD 16372 bytes
SHA-256: 678614f4a40a62134b64a4f9e8225184a0f9039ef4b931144459ad52617afecf
font_02_sfnt_off0000f1cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CC 10572 bytes
SHA-256: 67e75af91b54cce535934ed0656dd3e4d7293dbc3b36e2f92100fbfc74ed1372

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