Malicious PDF — malware analysis report

Static analysis result for SHA-256 63f2025c7167c339…

MALICIOUS

PDF

73.5 KB Created: 2021-02-22 13:58:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: dd3ad4e80a2991375abf054b32ed452e SHA-1: a8658f35d963295cf5d0b28ae644a8a70ed32516 SHA-256: 63f2025c7167c33900f0dd88d6285196c080341b00cd23237f5e8916635eb136
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1204.002 Malicious Link

This PDF file contains invisible links that lead to a CAPTCHA-themed lure, designed to trick users into revealing sensitive recovery information such as private keys or passwords. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or credential theft. No scripts were extracted, but the presence of multiple embedded URLs and the specific lure suggest a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • Invisible PDF links to CAPTCHA-themed web lure high PDF_CAPTCHA_LINK_LURE
    PDF contains invisible clickable link annotations that point to a CAPTCHA/capcha-themed web path. This is a common phishing and ClickFix-style routing pattern: the PDF itself is inert, while the linked page performs the credential prompt or fake verification.
  • 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://maypoin.ru/strik?utm_term=wordpress+admin+login+captcha+plugin In PDF document text
    • https://cdn.sqhk.co/napumefu/rIvVFjd/36970292174.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467043/normal_601a740e03f8f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466146/normal_5fe236de6ff38.pdfIn PDF document text
    • https://cdn.sqhk.co/mawejoxejobe/ghjjb3g/74397505327.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410201/normal_5fcf0be3d9e50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461202/normal_5fd26141d74b9.pdfIn PDF document text
    • http://momentshop.space/15497907974jj30t.pdfIn PDF document text
    • https://cdn.sqhk.co/sawomunuj/hhuGies/60963802171.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371814/normal_5fe8d93cee010.pdfIn PDF document text
    • http://effektzhizni.ru/44650159916ltls4.pdfIn PDF document text
    • https://cdn.sqhk.co/zagawodijimo/hbggkih/pixel_car_racer_crate_hack_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/sepunaro/jbeiefy/picu_hospital_in_kolkata.pdfIn PDF document text
    • https://cdn.sqhk.co/kojariwirip/cFieRhb/10345424311.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369491/normal_6024920163e6f.pdfIn PDF document text
    • https://cdn.sqhk.co/bofozuto/Ahxfie7/pepefowazepevasenojanomor.pdfIn PDF document text
    • http://sokolov.fun/clash_of_clans_hack_free_coc_gemsenv8q.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488842/normal_601258bf47ffc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e14d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE14D 5500 bytes
SHA-256: 46d85913d7b6cecc8b60490378464896633cc1e45cf8bea1eb85d21a04f7487b
font_01_sfnt_off0000f3e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E4 10840 bytes
SHA-256: 7ee7a78e9b97b5d4d12de6d6e97a4bee6c37797b2fa6f66bc79b1c4e41ddf999

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