Malicious PDF — malware analysis report

Static analysis result for SHA-256 63afaf752db3bb39…

MALICIOUS

PDF

79.3 KB Created: 2021-05-05 20:06:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 537b212d25e10a9b6e85c44f8c104a71 SHA-1: 2f18fb174d4c9ff2effdca2da379d16db1a1dc90 SHA-256: 63afaf752db3bb39cc027d849d685deda32a583b323511e5e4cc0fea969c9e07
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 external URIs points to 'https://xezojetit.ru/strik?utm_term=best+waterpik+for+braces', suggesting a lure to a potentially malicious website. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or a scam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/strik?utm_term=best+waterpik+for+braces
    • https://cdn.sqhk.co/kukisigafumi/bgeIgdU/6729254932.pdf
    • http://powuvomewekuxeb.getenjoyment.net/how_to_fix_a_kenmore_600_series_washer.pdf
    • http://ketaton.mywebcommunity.org/panuk.pdf
    • http://bowuvudofi.scienceontheweb.net/79073394853.pdf
    • https://cdn.sqhk.co/madilaxetevo/jggfRgg/skyblock_tips_and_tricks_roblox.pdf
    • https://cdn.sqhk.co/tijanukubo/ihnjbhd/change_face_video_app_iphone.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/599ed627-574e-4c28-98c0-d8c97495c3ef/eliot_goldfinger_human_anatomy_for_artists_free.pdf
    • https://02bc4616-4eae-4b38-b2c9-0e654f754ee0.filesusr.com/ugd/069df5_6c0647745f484b5f9f20255eaa2efeaf.pdf?index=true
    • https://1e2e1d2f-e5bc-406e-8ade-c93a3c5db6fe.filesusr.com/ugd/81c7be_059c922824884da98c8bd287a8b241ea.pdf?index=true
    • https://uploads.strikinglycdn.com/files/1d28959d-741f-4bc4-9061-af6138647a8d/pazemudogixinalote.pdf
    • https://6baea7ca-81e4-4a11-8410-716433a99462.filesusr.com/ugd/764aaa_da849d1a1f0d4d1aa419d32b21db2b0b.pdf?index=true
    • https://2987c0f4-171e-4473-b3f1-a5468658115b.filesusr.com/ugd/75ff8a_4d64fb87da614a6c96291834bbfca563.pdf?index=true
    • http://kebenubes.onlinewebshop.net/74897557967.pdf
    • https://0cfe495c-9a5f-46a1-a5f3-fb21b6211bac.filesusr.com/ugd/7aabb2_6abb3822be8b43188715c8fff79d9e91.pdf?index=true
    • https://uploads.strikinglycdn.com/files/50c512ff-eef2-4b56-872a-61cbc06f9369/what_kind_of_oil_for_yamaha_kodiak_400.pdf
    • https://0306adf0-382e-42f1-903d-71c3961c97f1.filesusr.com/ugd/7ff653_d056cc3d6d954536b692b748707007b4.pdf?index=true
    • https://aefbb2f1-1cfc-4a48-aab2-d72547d84173.filesusr.com/ugd/2f3ac6_8eccdef6f6f148b08dc1c46b47b0b3af.pdf?index=true
    • https://uploads.strikinglycdn.com/files/eccad510-7f99-48fa-bb99-01ad64b87f0f/xl_big_green_egg_table_hole_size.pdf
    • https://000bb656-a8cb-4e8b-9327-0b0ec99f56fe.filesusr.com/ugd/3f812e_bd5f2cbb483c4468bef11f8f0f73c4eb.pdf?index=true
    • https://034618a9-9b39-4f41-ad18-95bca1d1c80b.filesusr.com/ugd/48d9a1_7fa8b848ca5847de908198b0148a19b5.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8386979e-0e06-4161-b53e-1e619954a8ba/pusuf.pdf
    • https://dec4a425-646e-450a-80ca-a73a75d058ad.filesusr.com/ugd/ba3095_fa72ed86549c47d3b5cf87cd382a06ed.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_off0000f7d0.bin
327647da800c5dba33a5a780ff461c6ab92d0dc13b9758fbc84e9820f85989bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D0 5320 bytes
font_01_sfnt_off00010a14.bin
176ee82f3a9b5b580c445b7faa43144f6dc9f0d8f6c5e88f18147306c0f99107		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A14 10708 bytes

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