Malicious PDF — malware analysis report

Static analysis result for SHA-256 87de7d3551866a82…

MALICIOUS

PDF

91.6 KB Created: 2021-02-21 17:56:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: a3d69392174944164aede3e3dfb2e805 SHA-1: 20fb74201738967830e1b82b2b01672b9b950c10 SHA-256: 87de7d3551866a820c2a5bdfd0cb72ff81ebf37fedec3d3451d18d6988c609bf
174 Risk Score

Malware Insights

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

The PDF contains a callback phishing lure, instructing the user to call a phone number related to billing or security issues. The embedded URL points to known malicious redirector infrastructure, indicating a phishing attempt. While no scripts were extracted, the PDF structure and heuristic firings strongly suggest a phishing campaign designed to trick users into revealing sensitive information or falling victim to a scam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://crophysi.ru/123?utm_term=why+isn%2527t+my+voicemail+working+vodafone In PDF document text
    • https://cdn.sqhk.co/feguzuvubut/jcghVid/sawudegudil.pdfIn PDF document text
    • https://cdn.sqhk.co/motuxeneb/Ajfidgd/farm_king_crusher.pdfIn PDF document text
    • https://cdn.sqhk.co/sigidezok/Ygeihhj/88957755544.pdfIn PDF document text
    • http://santaparker.store/xazadrctzo.pdfIn PDF document text
    • https://cdn.sqhk.co/devepogisog/909QGia/bowakegubug.pdfIn PDF document text
    • http://dvigatel.guru/ylt46.pdfIn PDF document text
    • http://help-feedback-amzn3.xyz/kubunokadiwasatevowifasutq9mp.pdfIn PDF document text
    • http://molotkov.site/55153515755jel2m.pdfIn PDF document text
    • https://cdn.sqhk.co/pimibopugugo/gfgjJid/ziripekabarapepalorut.pdfIn PDF document text
    • http://becloud.website/legend_of_zelda_ocarina_of_time_artwork5z3rv.pdfIn PDF document text
    • https://cdn.sqhk.co/luwokiseg/jLEEBqb/sling_blade_cast_dwight_yoakam.pdfIn PDF document text
    • https://cdn.sqhk.co/bedazume/d7gjage/facebook_lite_apk_latest_version_for_android.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/fomaralunex/demesubozozujexemetebu.pdfIn PDF document text
    • https://s3.amazonaws.com/lanubili/barrio_bravo_roberto_melendez.pdfIn PDF document text
    • https://s3.amazonaws.com/jamuluvuvava/1090013244.pdfIn PDF document text
    • https://s3.amazonaws.com/tevigotu/95721056150.pdfIn PDF document text
    • https://s3.amazonaws.com/xabalaru/bloons_td_battles_mod_apk_latest.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001120d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1120D 5800 bytes
SHA-256: c027be66552f37e3bdf38855fa2b6a6c1fa517c71d435cf5ca7fbe3d290690bc
font_01_sfnt_off000125d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D4 11320 bytes
SHA-256: 4d19d2ca0b81c732dee50e5278df3b19a5c1ce9dc147b04a328cdb161e2e5510
font_02_sfnt_off00014ca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CA0 16028 bytes
SHA-256: ced8b21f0c91c47eb2a8e10a251844195ecd6fd413d2ce9a64032c85f057f195

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