Malicious PDF — malware analysis report

Static analysis result for SHA-256 3befd530abab51a2…

MALICIOUS

PDF

77.0 KB Created: 2021-03-24 02:58:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 72cdd8fe989981e181fe323d9c61e844 SHA-1: 1434f6e7d701b0a445ef290b716700ee742a9eb1 SHA-256: 3befd530abab51a2bdc11befb2dcc2ff0bfaa07b5d4432921734b33774f0352d
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent URL pointing to 'soxebez.ru', suggesting a phishing or malicious content distribution attempt. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or a trojan. No scripts were extracted, but the PDF structure itself is indicative of a link farm or lure.

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://soxebez.ru/award?keyword=speaking+ielts+vocabulary+pdf
    • https://cdn.sqhk.co/fusajovogi/hjgidha/wagepur.pdf
    • https://cdn.sqhk.co/lalamiteliw/2qhfjgV/hotel_luch_panichishte.pdf
    • https://cdn.sqhk.co/letarezetap/Gijjhq7/vepoxonojimugapotap.pdf
    • https://cdn.sqhk.co/susotizakaxe/Pgfzjgy/jodatonobota.pdf
    • http://likedizar.medianewsonline.com/sowizurikagosesuziro.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/6818e9a6-fe1d-4a85-8656-84a4da36e263/russian_alphabet_cursive.pdf
    • https://uploads.strikinglycdn.com/files/f26055d8-86e0-4319-be95-52db59fb7d40/98067389460.pdf
    • https://78636f1b-f2d6-4e4a-b4e1-07eac4c165d1.filesusr.com/ugd/434c97_62752d8ae2aa4690b3e9305f6699b552.pdf?index=true
    • https://uploads.strikinglycdn.com/files/1771f99f-44dc-4390-90b3-abe6655c19fe/xerexunofowefaz.pdf
    • https://s3.amazonaws.com/litunux/android_cannot_connect_to_wifi.pdf
    • https://uploads.strikinglycdn.com/files/90fe5535-dedc-499c-bcdc-2dc0b0c9fb39/powerflex_40_manual_espaol.pdf
    • https://uploads.strikinglycdn.com/files/57c5b1a1-d3fa-4268-a9d5-65c2a703672a/kakunetil.pdf
    • https://835a0401-7144-467e-aacc-710587930ffc.filesusr.com/ugd/432cba_5075ee4c536e4705a2cff500cd243c90.pdf?index=true
    • https://s3.amazonaws.com/dumupa/37347392596.pdf
    • https://uploads.strikinglycdn.com/files/bd98985b-58eb-4af1-8dd4-2617f5f67371/cyberpunk_2077_ps4_release_time.pdf
    • http://dolanuvusipegu.myartsonline.com/33807768506.pdf
    • https://s3.amazonaws.com/fevobelijogal/digovew.pdf
    • https://uploads.strikinglycdn.com/files/7e992aad-0455-4a84-bce2-0e2b68360179/wijumobugokoj.pdf
    • https://9e77dbea-16d6-438e-9859-4a68c5388828.filesusr.com/ugd/3225da_33697a1967fd4155926c99eddff9096c.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_off0000ef3a.bin
b07a5165ba22a1d5f20033e9785ffd45b062f92df48cf5a560aa3b1b25cc80b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3A 5792 bytes
font_01_sfnt_off0001030f.bin
878682e7e1defdbebd96755c7902520729213284d8212246ba9e7460e015ed14		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1030F 10544 bytes

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