Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d52017a4e88c907…

MALICIOUS

PDF

70.9 KB Created: 2021-03-17 17:24:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 6e4f5fc075ae727a952c7b41bae85b15 SHA-1: 81258c6a457a01a2b504f268e5d2ac5fce0736c0 SHA-256: 6d52017a4e88c907ab6eb4bada959f8e1548e14b18078f9125dc368c76717cc0
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO poisoning and phishing. One prominent URL, 'https://zajinet.ru/wix?keyword=mary+welsh+elementary+computer+lab', suggests a lure to a malicious site disguised as a search result. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://zajinet.ru/wix?keyword=mary+welsh+elementary+computer+lab PDF link annotation
    • https://borubonaxufiza.weebly.com/uploads/1/3/5/3/135318051/kogokodenib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445114/normal_5fe6c72178710.pdfIn PDF document text
    • https://vaxokivov.weebly.com/uploads/1/3/1/4/131453734/bafej_mutevoluro.pdfIn PDF document text
    • https://pokotozumunas.weebly.com/uploads/1/3/1/4/131453498/rosagiked_sobutog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453563/normal_6026d381e3006.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367313/normal_5feb8b3aa4af3.pdfIn PDF document text
    • https://lemusudavigi.weebly.com/uploads/1/3/5/3/135395292/judubegefulodoza.pdfIn PDF document text
    • https://koruguliduni.weebly.com/uploads/1/3/4/8/134896859/faffcf7ea5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gewisetug/wifi_wps_wpa_tester_hack_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/jebokizez/7336686235.pdfIn PDF document text
    • https://s3.amazonaws.com/gurupixabogivaz/puke_face_emoji_android.pdfIn PDF document text
    • https://0f926834-650c-4d5a-b53c-ad60ae412ccc.filesusr.com/ugd/6a44d8_1963fd53213b443299b372fdbbcd19f8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/taguxif/bafang_bbs02_250w.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2059249b-f076-4f64-8a67-906f277b40b6/whirlpool_thin_twin_water_wont_drain.pdfIn PDF document text
    • https://s3.amazonaws.com/verirejon/wavonani.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bca57c0e-185e-4d11-8861-3913256e0139/47555177777.pdfIn PDF document text
    • https://s3.amazonaws.com/risisipajole/free_beetalk_for_android_latest_version.pdfIn PDF document text
    • https://s3.amazonaws.com/benubapopikaj/18516342305.pdfIn PDF document text
    • https://s3.amazonaws.com/befafuni/85381752773.pdfIn PDF document text
    • https://s3.amazonaws.com/kotodur/rv_toilet_seal_lube.pdfIn PDF document text
    • https://42190e62-4dca-482d-a077-ae7b222d7779.filesusr.com/ugd/b91392_2e635c3d7aa54aedbb1166bc7a4b4e15.pdf?index=trueIn PDF document text
    • https://86042ffc-9b62-460b-8552-fb2522205a17.filesusr.com/ugd/4f92c1_b320ca04e7654faaa269f8781906cf34.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A3 5512 bytes
SHA-256: 53a90d17b62dece3bc284693b4b2c60a71ce47e85173a801698dc3a71b867271
font_01_sfnt_off0000ea53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA53 10364 bytes
SHA-256: 33fd9add219c4d5909267e65ca599aedac23d14f82f82a7dbe1c2ce4d95bf7b8

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