Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e3d826e23524c90…

MALICIOUS

PDF

103.3 KB Created: 2021-04-18 07:02:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dcd620525af62591774c5d799e1ede70 SHA-1: 5728051f8a3ed3032162bf35a971b2269a7cc6f0 SHA-256: 1e3d826e23524c9023793463c52577ef950bd1d53c7f9086a6804c414ff71115
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 to SEO-optimized PDF documents, suggesting a link farm for traffic manipulation or phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs, particularly the one on 'jumiwimov.ru', are likely used to redirect users to malicious content.

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-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://jumiwimov.ru/strik?utm_term=final+fantasy+7+original+full+walkthrough
    • http://tiwujatujoput.mygamesonline.org/free_to_word_converter_download_for_pc.pdf
    • http://futudobofexile.iblogger.org/android_pay_uk_barclays.pdf
    • http://kunepuvobimamin.medianewsonline.com/orthographe_gratuit.pdf
    • http://nusowutevu.getenjoyment.net/1539449038.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/082b9a05-8352-41c1-9eaf-567bbb0de474/walmart_photo_center_hours_near_me.pdf
    • http://nonozud.rf.gd/65526125263.pdf
    • https://uploads.strikinglycdn.com/files/917641f0-4e0a-4c38-8c2c-5c78c4aafc3a/14508657714.pdf
    • https://s3.amazonaws.com/zuguvoxoki/how_long_will_roomba_960_battery_last.pdf
    • https://s3.amazonaws.com/kegubinefuda/2506689405.pdf
    • http://vedegisawopuf.epizy.com/tejagogitazivojom.pdf
    • https://s3.amazonaws.com/wewuxuviwar/are_stackable_washer_dryers_good.pdf
    • https://s3.amazonaws.com/punagilelabon/vobufirosowivogafagu.pdf
    • https://s3.amazonaws.com/pesetufavo/25328096717.pdf
    • https://bc3ee532-4344-4262-9f0b-d8353e2229a5.filesusr.com/ugd/6ca3f6_732e0cfb18a24a76be43323ef9f50136.pdf?index=true
    • https://s3.amazonaws.com/ximupuv/71997680114.pdf
    • https://e1c07d4e-6587-4767-b76f-5dea9cf3e327.filesusr.com/ugd/51a829_ef29dd600cb346b580e728cfe34ae18b.pdf?index=true
    • https://748e6e98-33e2-4bd1-95aa-01ea3505a154.filesusr.com/ugd/704f6c_fb5df9d8d8834621a6bf30c8734e404b.pdf?index=true
    • https://313cea95-bd78-4864-9d9d-3b26c3bbe0bd.filesusr.com/ugd/2142af_4521197303ce45e098e2183d0b77a945.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_off00015710.bin
f6b54e5111d34aaa9512eae8b4d069f5e4c0a29a98a7a55a3fe8d2d74b3988a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15710 5320 bytes
font_01_sfnt_off0001694d.bin
78b9b1190bd6269968f8f4275347bed3a6acd906cf060fdfd4f08c95df55cb38		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1694D 11208 bytes

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