Malicious PDF — malware analysis report

Static analysis result for SHA-256 48f26b1e20bd6d3a…

MALICIOUS

PDF

71.5 KB Created: 2021-03-10 05:35:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 308cdc7ada0b9870af46f67d0e99a79b SHA-1: d538d4c3bd4e3326f0224a45295bff892da2d0c6 SHA-256: 48f26b1e20bd6d3a88d90d1b32296108404a565161fd410f4022ec0941b9684a
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, many pointing to disposable hosting, suggesting a link farm or phishing lure. The presence of embedded URLs and the overall structure strongly suggest it is designed to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://midufefew.ru/award?keyword=common+roots+prefixes+and+suffixes+pdf PDF link annotation
    • https://cdn.sqhk.co/kekazorub/onzb9ia/94561276894.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424013/normal_5fe7ec6dc8735.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389793/normal_602da571ae978.pdfIn PDF document text
    • http://idealicaitaly-ufficiale.site/gusezaguskpkv.pdfIn PDF document text
    • https://cdn.sqhk.co/pelotuwew/EWsgjge/transmission_shop_near_me_open_on_saturday.pdfIn PDF document text
    • http://bachanalytics.com/ssc_challan_form_download_201936c7k.pdfIn PDF document text
    • https://cdn.sqhk.co/purizepore/Cjjjgia/19187216731.pdfIn PDF document text
    • https://tuledekubixa.weebly.com/uploads/1/3/4/7/134722649/newogolunosusof_nokofikebam_xosiranedulofe.pdfIn PDF document text
    • https://gatojodegapov.weebly.com/uploads/1/3/1/6/131637656/4091759.pdfIn PDF document text
    • http://indohealth365.online/8492746995dctko.pdfIn PDF document text
    • https://cdn.sqhk.co/vagekoxes/3gigxge/offroad_4x4_truck_driving_game_download_apk.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/0cee741b-bd34-4055-8e63-70616c039201/tipiwemeramobi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fdc7356-d94e-42be-9deb-8d15ec058829/gazuzezipezezep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3ba2700-b114-4868-8db7-880a3ca4b5b4/96100859929.pdfIn PDF document text
    • https://b4e79a3f-0083-4b26-8056-4fe87fb46dfd.filesusr.com/ugd/332c1b_8853c0737f0441aba3acb7f2efbe7836.pdf?index=trueIn PDF document text
    • https://e028ba52-6c86-493e-86b7-fecf7cd1c3eb.filesusr.com/ugd/bcb9fd_bf01a3cfaa3748b2b82d789cd8f40715.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_off0000dbec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBEC 5128 bytes
SHA-256: e67a9c4328d55dc33a2f57130f78e17e612b70b7f9ce6a5d8f12e1f2be33ed3c
font_01_sfnt_off0000ed48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED48 10452 bytes
SHA-256: 72f24012d5ef3893314f9a721cd561685958beebb45076785887d32b21b717bb

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