Malicious PDF — malware analysis report

Static analysis result for SHA-256 558bac8cb55d9053…

MALICIOUS

PDF

80.3 KB Created: 2021-03-10 22:24:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: fa9fbc8b7ceafb1739c5b4b313b353c6 SHA-1: ed9b851fc661045cb6b6ceccbebf9494bd1aacbb SHA-256: 558bac8cb55d9053b48de0c0743be9328da0d8886fdab671a13be80296c06f8a
162 Risk Score

Malware Insights

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

The file is a PDF containing a link to a known malicious redirector, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of a malicious URL and the ClamAV detection indicate a phishing or malware distribution attempt, likely delivered as an attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://yafferge.ru/123?utm_term=phpspreadsheet+border+not+working In PDF document text
    • http://tehnotop.store/metal_slug_3d_androidtet1q.pdfIn PDF document text
    • https://cdn.sqhk.co/xamitarerivu/xhhjjP3/27121165869.pdfIn PDF document text
    • https://cdn.sqhk.co/totimujid/elLYUhj/teddy_roosevelt_boxing_white_house.pdfIn PDF document text
    • https://cdn.sqhk.co/dixejetafap/ceifUQG/werewolf_game_all_cards.pdfIn PDF document text
    • https://cdn.sqhk.co/letinumi/7yMssQF/panadotatofibusunimomew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486037/normal_602fc04ad6dbc.pdfIn PDF document text
    • https://cdn.sqhk.co/gadukupuwe/gigfbxR/carrera_rc_battery_3._2v.pdfIn PDF document text
    • https://cdn.sqhk.co/dejuxafe/lIhbggr/budujefazixek.pdfIn PDF document text
    • https://cdn.sqhk.co/bitowiso/dgcggjf/white_noise_lite_machine_kmart.pdfIn PDF document text
    • http://esmoney.site/mafidawozududosalerakeg1dzet.pdfIn PDF document text
    • https://cdn.sqhk.co/bifugudawesu/dgejhbP/free_resume_templates_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/rejibebadit/XgeMghQ/buburakenajovuredapox.pdfIn PDF document text
    • https://cdn.sqhk.co/giganopof/ieibkdt/pottery_barn_baby_costume_sizing.pdfIn PDF document text
    • https://cdn.sqhk.co/zubavagi/4jdiidz/trailer_hitch_ball_mount_harbor_freight.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382973/normal_5fc8122f175cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408187/normal_601a837361ebd.pdfIn PDF document text
    • https://cdn.sqhk.co/matijamaj/jgjhjjK/to_do_list_notebook_online.pdfIn PDF document text
    • https://cdn.sqhk.co/xilasexiki/YjfjcBo/67648453070.pdfIn PDF document text
    • https://cdn.sqhk.co/jesovolavig/NghhgZf/sebob.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f75b7bb9-6b04-4868-b3a0-36d2253a09a1/a_level_biology_edexcel_topic_questions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04092bcd-c567-4ba5-93a1-5fd33df27dcc/bewulalagan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e923818-3308-4ccb-8288-8371715546c8/83122936138.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00bb9088-6f6e-4e78-b9f4-4a59aa162901/votam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbfeda40-98f5-4eac-b5f9-b3b11824256b/kuvitudulobibirokabuwiro.pdfIn 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_off0000f6ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EA 5488 bytes
SHA-256: a95a1151fe9809c005c234b9ebb69cb4304ac7a13d96c2a63879062fcb41225c
font_01_sfnt_off00010995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10995 13120 bytes
SHA-256: d9851b873d4c0a5d6f5c6fc0e802a7d97356fa1e4f57e289ad92685ca8a77080

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