Malicious PDF — malware analysis report

Static analysis result for SHA-256 86607a640d9458b2…

MALICIOUS

PDF

79.2 KB Created: 2021-03-12 14:37:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f45dcbb977e5d356154e1a62c2da4399 SHA-1: ea69be9857e21ecbdf4eea6083f57d4b6de15263 SHA-256: 86607a640d9458b2f1cf9ec4bc6c98554f44b052afe5aa0698e9771dfb32019d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized and point to potentially malicious content, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded URLs and the overall structure point towards a phishing or malware distribution scheme disguised as a legitimate document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://zajinet.ru/wix?keyword=amazon+this+order+contains+a+gift+customs
    • https://cdn.sqhk.co/disonixures/gjpQhdY/defender_3_mod_apk_unlimited_all.pdf
    • http://vevebopawo.mywebcommunity.org/varini.pdf
    • http://hookup154.site/romijemuwovawumakodv6ife.pdf
    • http://banque-populaire.best/contact_lenses_online_uk_cheapestioww9.pdf
    • https://cdn.sqhk.co/pirujezexod/2i55Jz6/32571447719.pdf
    • https://cdn.sqhk.co/numokafas/hhgc5vZ/euro_train_simulator_apk_mod.pdf
    • https://cdn.sqhk.co/vasozaponem/ijeoifp/21742239107.pdf
    • https://cdn.sqhk.co/wemojezuvegi/geCHUia/agradecimientos_de_tesis_de_licenciatura.pdf
    • http://csxmoney.info/2559311657965nnn.pdf
    • http://leaninrzpd.site/message_app_for_macbook_proyn50o.pdf
    • https://cdn.sqhk.co/xejudawadoni/jisoQhe/samsung_email_gmail_unable_to_validate_account.pdf
    • http://katipef.medianewsonline.com/lg_vn170_release_date.pdf
    • https://cdn.sqhk.co/gixotagokezu/kwihhaL/top_10_skateboard_tricks_for_beginners.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://didaduxazej.epizy.com/61465382006.pdf
    • https://83372c7a-1065-4b07-8284-b64562b46e84.filesusr.com/ugd/035489_e08900dc1f0242f1a97a4b95080cf451.pdf?index=true
    • https://0ccb9a81-bd3c-41bd-bc79-2352350f0e5e.filesusr.com/ugd/95ea6b_7e834cd4e51d4357a876165cfe7bfc90.pdf?index=true
    • http://buxazub.epizy.com/texas_child_support_direct_deposit_form.pdf
    • https://f07eb630-23ff-4298-a1df-d7940f1ba2dc.filesusr.com/ugd/097a5b_1fecb188d1c645fba3914b5fd6545917.pdf?index=true
    • http://vigavanoxe.onlinewebshop.net/64023742172.pdf
    • https://107a3552-ed21-4f5d-95e3-510b6eae4444.filesusr.com/ugd/21bbef_71b8685e4f6947179015156c0ca995da.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7ee.bin
47ee28c5c64a8070311c8d8d7a834c7dd610e54f43aff96803b9ba9d27e06163		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EE 5444 bytes
font_01_sfnt_off00010a4c.bin
9c34416739609d1ad3c215aeeddfcbd1da116b3c14f538be66909991338ff98a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4C 10824 bytes

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