Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c397ca658fa6850…

MALICIOUS

PDF

80.1 KB Created: 2021-03-10 21:15:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb663af6e7ced6bef1bc9bcd6be533f1 SHA-1: 16ad8bdf7fdc8a09046ded5a63a584534cc20626 SHA-256: 4c397ca658fa6850e45c8fbe8d604824b2eef97464b96f9d31cfe756f0514f63
116 Risk Score

Malware Insights

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

The sample was flagged by a machine learning classifier and ClamAV as malicious. It impersonates a cloud document lure, directing the user to click an external URL. The embedded URL `https://seumenha.ru/strik?utm_term=how+to+become+a+software+development+manager` is the primary indicator of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://seumenha.ru/strik?utm_term=how+to+become+a+software+development+manager
    • http://tulumiv.medianewsonline.com/xemadadutigar.pdf
    • http://gisoboxizaza.mygamesonline.org/13397963316.pdf
    • https://cdn.sqhk.co/pajokiman/gnEiaNT/73375119973.pdf
    • https://static.s123-cdn-static.com/uploads/4449769/normal_6006a54e21918.pdf
    • https://cdn-cms.f-static.net/uploads/4378608/normal_600c239803253.pdf
    • http://bumasujofoj.getenjoyment.net/4030121047.pdf
    • http://zumewidife.mygamesonline.org/nowafukikedix.pdf
    • http://zixaxagewan.mypressonline.com/83615124357.pdf
    • https://cdn-cms.f-static.net/uploads/4408330/normal_6046a44ae87aa.pdf
    • http://dazolovegom.mygamesonline.org/poulan_chainsaw_carburetor_parts.pdf
    • http://garanibukumom.scienceontheweb.net/29536742333.pdf
    • https://static.s123-cdn-static.com/uploads/4412902/normal_5ff6873495181.pdf
    • http://fejiximodanu.mygamesonline.org/baseband_and_broadband_topology.pdf
    • https://cdn.sqhk.co/guranotup/jgcjjYE/barbecue_sauce_calories_mcdonalds.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fumibilulad.atwebpages.com/bonheur_d_occasion_livre.pdf
    • https://uploads.strikinglycdn.com/files/b2cf1187-d47a-44b6-80dd-efd30d41cf28/google_cardboard_apk_2018.pdf
    • https://uploads.strikinglycdn.com/files/b8a42ba3-f469-4fdf-8cd0-3bbc4cf635b9/rutugoposozubapitinutuji.pdf
    • http://nejarisiwudu.atwebpages.com/83027551380.pdf
    • https://uploads.strikinglycdn.com/files/76a40800-315b-4ab0-a59f-ca5b82567fa1/how_to_identify_organic_functional_groups.pdf
    • https://uploads.strikinglycdn.com/files/fea35c8d-0f42-4228-bbb9-86e88772d195/52792311222.pdf
    • http://jatoxat.atwebpages.com/46669093448.pdf
    • https://uploads.strikinglycdn.com/files/d9338904-ead6-41b8-a018-f41fa971247e/swing_trading_for_dummies_2nd_edition.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_off0000fb6f.bin
a4f9e8ca2197057842bef7047f8a5f3bdcca8ebcb24e3529f7cdfb5fa3b996c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6F 5728 bytes
font_01_sfnt_off00010ee8.bin
d0455d637960a001c917b87b624e9677e684d56a9ae55bccb16e0b21ce07027e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE8 10512 bytes

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