Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cbdcaf637c39e5c…

MALICIOUS

PDF

88.6 KB Created: 2021-03-14 04:19:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eef1ce46defc12f2c41990a643bb9908 SHA-1: 179b89ab62134d336a0c35138705dd4173c90cdf SHA-256: 9cbdcaf637c39e5cbfe6200ed45975643a461b15288562e1be7289b7f35d1c91
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a spearphishing attachment used to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://golowaki.ru/wix?keyword=uncw+blackboard+learn
    • https://didunoduwogu.weebly.com/uploads/1/3/2/6/132682107/lexari_fevidemogifaxo.pdf
    • https://pinukozemaf.weebly.com/uploads/1/3/4/7/134713375/peximexa.pdf
    • https://static.s123-cdn-static.com/uploads/4501374/normal_5ffa6c53b85d9.pdf
    • https://cdn-cms.f-static.net/uploads/4417535/normal_6041862028b53.pdf
    • http://xulazawelinuze.scienceontheweb.net/how_to_connect_wireless_mouse_with_usb_receiver.pdf
    • https://noxiwufozale.weebly.com/uploads/1/3/0/8/130814513/975a518f.pdf
    • https://cdn-cms.f-static.net/uploads/4404969/normal_60327d81ae554.pdf
    • https://cdn-cms.f-static.net/uploads/4411252/normal_600c9ec3d480c.pdf
    • https://wewivipumi.weebly.com/uploads/1/3/0/7/130775870/41c6c.pdf
    • https://static.s123-cdn-static.com/uploads/4401985/normal_5febe4b603906.pdf
    • https://pitajuzijos.weebly.com/uploads/1/3/4/8/134885257/kiwuserovud.pdf
    • https://cdn-cms.f-static.net/uploads/4487382/normal_603430106f7ef.pdf
    • https://zilibadokaji.weebly.com/uploads/1/3/2/6/132680781/6403667.pdf
    • http://wazepewazivulil.mywebcommunity.org/hp_photosmart_c5280_all-in-one_printer_price.pdf
    • https://cdn-cms.f-static.net/uploads/4455901/normal_602530b5b8c82.pdf
    • https://static.s123-cdn-static.com/uploads/4475209/normal_5ffc5505e9f6a.pdf
    • https://torevoxun.weebly.com/uploads/1/3/2/7/132712334/3021377.pdf
    • https://kodopikowi.weebly.com/uploads/1/3/4/6/134659436/6318340.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://c06d174a-caca-4ab2-b5a0-4525cd3135d4.filesusr.com/ugd/856cea_8023760368a44d8591a991cd2ede1640.pdf?index=true
    • https://167c2301-eccc-4e3a-a609-38a4f17b9bf8.filesusr.com/ugd/b1dabf_c1142f233cdd4acf978fcf50ae82ffc4.pdf?index=true
    • https://f89b8795-a90f-4359-81e0-6309601a98d9.filesusr.com/ugd/8e7730_86bb7883213a41f785fb3329f254c68c.pdf?index=true
    • https://ac3db616-04cb-40f1-8357-c67041f5e20c.filesusr.com/ugd/eda9ba_b05ffe1b3bfa40c29998cc5cb3ee34a1.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010516.bin
2d7a802b1d04e2e8a5750c44e9f708c0cf16de11a874446aaeecf9b8fd736bbe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10516 5044 bytes
font_01_sfnt_off00011666.bin
a56534963b7abc210d80d438cef86faff8da1cbfdcc13a5529631d228c163417		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11666 11544 bytes
font_02_sfnt_off00013de2.bin
e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13DE2 16204 bytes

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