Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5552040528e7066…

MALICIOUS

PDF

76.9 KB Created: 2021-03-22 10:59:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e10b2d2fdd3aa0fd69be23efb1e390dd SHA-1: 7acfaeeed45e394f5c162f1e60fb7490a8218abd SHA-256: f5552040528e70667c00c9de9ce0134bf01fdd59c87111791de808b36b2630c3
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. One of the primary URLs, 'https://kuzutuzo.ru/award?keyword=mh+cet+law+2020+books+pdf', is presented in a way that suggests a search result, aiming to trick users into clicking. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://kuzutuzo.ru/award?keyword=mh+cet+law+2020+books+pdf
    • http://klyshsheff.xyz/75760632119o1ztf.pdf
    • http://kukushka.space/86000559305y7vnr.pdf
    • http://kungfumalibu.com/wozivonululabalact6ig.pdf
    • http://wrinklestiltskin.com/easy_share_wifi_file_transfer_apk9d4t9.pdf
    • http://item-get.top/nomatinekel1n8yn.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nosepevozux/adventure_capitalist_mod_apk_6._3._3.pdf
    • https://8c1dc56a-a131-4b43-acff-3635b9115217.filesusr.com/ugd/90423f_392b665025504a53b7af941e57fc7018.pdf?index=true
    • https://uploads.strikinglycdn.com/files/388f2516-5b18-4da8-bf65-b561ceba4bf4/how_to_talk_to_someone_at_work_you_like.pdf
    • https://s3.amazonaws.com/lorifumofelu/definition_of_international_law_according_to_oppenheim.pdf
    • https://s3.amazonaws.com/pukaridimupo/eclipse_ide_for_java_developers_neon.pdf
    • https://s3.amazonaws.com/wowonesoribu/brand_identity_system.pdf
    • https://c3d762b3-5d50-4891-ab6d-43710edd2423.filesusr.com/ugd/3254bf_c07ccda40d3f439c9d38f616d4b1ea6a.pdf?index=true
    • https://s3.amazonaws.com/liwafo/jumadatomi.pdf
    • https://bbaef297-c986-4b42-acb3-0fd65605e280.filesusr.com/ugd/e9fc71_16a509e8c5324475ad63049f02ae79b1.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ed072bfb-055c-4ce6-a9b2-081c4765b392/resumen_de_el_caballero_dela_armadura_oxidada_capitulo_1.pdf
    • https://uploads.strikinglycdn.com/files/c6ef3373-487d-4ee5-8628-79814abe1b53/why_does_my_seatbelt_light_keep_flashing.pdf
    • https://s3.amazonaws.com/fobupojowojon/soxozedigawivufip.pdf
    • http://bubewap.rf.gd/vefiz.pdf
    • https://b4095e1f-5e43-4c35-8b28-ff0c3185c247.filesusr.com/ugd/9cc3de_c93a7207a17b471a8c57e2591e8333b8.pdf?index=true
    • http://zusunikumejimet.rf.gd/google_chrome_for_mac_desktop.pdf
    • https://uploads.strikinglycdn.com/files/da1e968b-ddc4-499d-b72d-9cad6c5a6cfa/logic_of_english_essentials_reader.pdf
    • https://s3.amazonaws.com/kakekojezutok/bigogaluwobobi.pdf
    • 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_off0000ed8f.bin
2a7b8e41d2e2214400976f7d7ee8f6d2605ae59f36f68e63b370e134310c09cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED8F 5720 bytes
font_01_sfnt_off00010128.bin
cd6f007a7411ae209bfa732caf8c8689ec153a7ce4a1821942b62d8451109295		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10128 10972 bytes

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