Malicious PDF — malware analysis report

Static analysis result for SHA-256 f86f1def6e06d894…

MALICIOUS

PDF

77.0 KB Created: 2021-03-03 18:01:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: d9a839617f9f5e2fda63d6c303d58260 SHA-1: 108ee71e3a648e5f4640ad50b2d436af225fe870 SHA-256: f86f1def6e06d8944e3d5cd821085e4db355a825752d8a8a04984f39ad2eb1c8
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious phishing content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating numerous links on disposable hosting, suggesting an attempt to obscure malicious intent. While no scripts were explicitly extracted, the presence of external URIs and the overall structure strongly suggest a phishing or malware distribution attempt.

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://soxebez.ru/aws?utm_term=scansnap+s1500+install PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4482853/normal_6018208c8da67.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367300/normal_5ff30d826afff.pdfIn PDF document text
    • http://pusewuvi.medianewsonline.com/arms_reach_co_sleeper_mini_manual.pdfIn PDF document text
    • http://rinetezomado.22web.org/acrobat_professional_11_mlp_aoo.pdfIn PDF document text
    • http://zakomuxoza.getenjoyment.net/25382575390.pdfIn PDF document text
    • http://sasozixapedadi.iblogger.org/42055918191.pdfIn PDF document text
    • http://tonimaxuta.iblogger.org/xesawujenopojeguvakog.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390660/normal_5fddbac25aa2d.pdfIn PDF document text
    • http://bufaturofonoko.22web.org/43595366417.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://lamekukibudinos.epizy.com/transfer_iphone_contacts_to_android_icloud.pdfIn PDF document text
    • http://xatonerux.epizy.com/loxofufukuman.pdfIn PDF document text
    • http://kebenubes.onlinewebshop.net/74897557967.pdfIn PDF document text
    • http://petojijoxura.onlinewebshop.net/how_do_i_set_the_clock_on_my_sony_icf_c218.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/35131781548.pdfIn PDF document text
    • http://bukaduxanob.epizy.com/error_reported_above.pdfIn PDF document text
    • http://bifovigavij.myartsonline.com/minikib.pdfIn PDF document text
    • http://mobukug.myartsonline.com/samsung_galaxy_grand_prime_cover_case_bling.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE295 4812 bytes
SHA-256: 4ea5fd31148110d250c95d957a4a5cec3f4c716874ce5e51eac5f71dcd47e792
font_01_sfnt_off0000f2ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EC 11068 bytes
SHA-256: a9a726bf39b389b938d219785584dddbfcc56d87c0563485202ad6f84b789bae
font_02_sfnt_off000118bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118BD 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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