Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8290b7cb91132a9…

MALICIOUS

PDF

77.4 KB Created: 2021-04-07 10:44:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: c941f1b63ec7997b92a0fe50716ef893 SHA-1: 000719d88d63342e0cb8431ae4c80375c32389d5 SHA-256: f8290b7cb91132a90cd4ebd285a3ca63bbfbc6e2bda2a9d51b019d2c7f6cb91a
126 Risk Score

Malware Insights

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

The PDF file contains a URL designed to trick users into clicking it by mimicking a search result for a medical topic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the embedded URI is the primary indicator of compromise.

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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://jacksth.ru/award?keyword=pathology+of+breast+cancer+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4497081/normal_6038388a6b5c0.pdfIn PDF document text
    • http://sberbank.link/71034818812mjni2.pdfIn PDF document text
    • http://portkamesto.site/chase_checking_account_balance_sheetoumrs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403540/normal_6047ca6cd9858.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375195/normal_602ca3571860a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481990/normal_604a31a8902a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500677/normal_605ba5d0e1dc1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411686/normal_6021eba4d34a5.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/f320a882-4801-47a6-9668-766c899de055/ejercicios_resueltos_anualidades_matematica_financiera.pdfIn PDF document text
    • https://37459de8-d961-4a2a-897a-801dad55dcfc.filesusr.com/ugd/1395e2_765aa6e67a6b483480939fc4e37dce18.pdf?index=trueIn PDF document text
    • https://dda5c79a-a75d-44d9-a006-48dec3bfe172.filesusr.com/ugd/115d6e_f2781cbad32b41e8a1f5dd2c00cf770a.pdf?index=trueIn PDF document text
    • http://zasaraba.epizy.com/zifurobumimavinunoxogov.pdfIn PDF document text
    • https://2987c0f4-171e-4473-b3f1-a5468658115b.filesusr.com/ugd/75ff8a_b720e3a604074cc5bb8487b393aa632d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc0f5bcb-07be-4e61-8b60-50bb95e650ac/70934364975.pdfIn PDF document text
    • http://wepezip.epizy.com/android_10_galaxy_s10_verizon.pdfIn PDF document text
    • http://kojexeruxub.epizy.com/xojevejigudagatakin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c366141e-4f04-4ef9-8962-ab7d53d7ded7/11448134900.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8df09efb-469f-443a-afb3-2ff1702347a0/20854324244.pdfIn PDF document text
    • https://7a579b3f-ce96-4c66-abdc-991530493d29.filesusr.com/ugd/010c6b_bfc7e726ea5b49dfbd49fe1eaa5bff5e.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_off0000eefa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFA 5660 bytes
SHA-256: 7e619d95dcbf21ce7a425ff83b0d2049e7103373b459aebcb91d385783960b30
font_01_sfnt_off0001023f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023F 11404 bytes
SHA-256: 47e6e94db2abbbd0cfd827224f2c575302a654d287b4cb6435332f6f0cc5e655

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