Malicious PDF — malware analysis report

Static analysis result for SHA-256 53a890236efef6b6…

MALICIOUS

PDF

76.8 KB Created: 2021-03-22 21:21:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: dadca6b76d20bfe5f822be392c97c27a SHA-1: aa982fc5093a94d5d791943d8449210c45bcaa14 SHA-256: 53a890236efef6b6fc30960bc650ecfd8d18ee27520c7895a4b467ab055322a5
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains numerous external URIs, with a high concentration on disposable hosting, suggesting a link farm used for redirection. The embedded URLs and the nature of the heuristics point towards an attempt to redirect the user to a malicious site, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://jottigo.ru/123?utm_term=encounters+and+foundations+to+1800+study+guide PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4427783/normal_5fe4221b23378.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407795/normal_603ec43f844d4.pdfIn PDF document text
    • http://lololoj.sportsontheweb.net/nazilelomupufemipafip.pdfIn PDF document text
    • http://povulofi.mywebcommunity.org/figojipolalonuji.pdfIn PDF document text
    • http://winoxolupuvil.getenjoyment.net/best_tattoo_books_for_sale.pdfIn PDF document text
    • http://upsbox.ru/fubometibipisetlzhrs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370791/normal_6023645ca4cba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496170/normal_5fffe96401ae0.pdfIn PDF document text
    • http://usacreditscore.info/zojirushi_ve_hybrid_water_boiler_4l3r1q0.pdfIn PDF document text
    • http://mitutazulew.22web.org/job_agreement_letter_format.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/tonemakopinibem/fight_for_me_heathers_piano_sheet_music_free.pdfIn PDF document text
    • http://nupakavidowux.epizy.com/dividing_fractions_examples_worksheet.pdfIn PDF document text
    • http://puvuxidaw.epizy.com/26467732868.pdfIn PDF document text
    • http://wagenugeti.epizy.com/south_african_drinking_water_quality_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/sixolose/japoxetokel.pdfIn PDF document text
    • https://19d8af67-ac20-4a7c-8ffd-69be953788a8.filesusr.com/ugd/578741_fc06d08237d647b1a0322119e337641c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pusolefosex/associate_of_science_csn_degree_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/wupagivoz/zakulawulifuzezafirinos.pdfIn PDF document text
    • http://sazebufaz.atwebpages.com/tolewamobubobuni.pdfIn PDF document text
    • http://mojogoralil.onlinewebshop.net/bronkopneumonia_anak.pdfIn PDF document text
    • https://065b66ee-25d8-4381-b309-094abc4d823c.filesusr.com/ugd/2703e6_edb162c1c6774f4da35446f9ec3f3369.pdf?index=trueIn PDF document text
    • https://f13dd0f9-fe0a-4257-a88d-d9af1a1cf0e3.filesusr.com/ugd/d954c5_e587e1e4878c48299d4503e941e20a62.pdf?index=trueIn PDF document text
    • https://4407eba0-147d-4e9d-98ff-19010b67f466.filesusr.com/ugd/c1f2fd_60863cd39fe6499f8704f0701a406e64.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_off0000ed1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1B 5604 bytes
SHA-256: 3ec45eab3bed7e65a3d2df7fcb1339f58b267cadf5e85d04c41eab95a0ff9b1a
font_01_sfnt_off00010053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10053 10820 bytes
SHA-256: d18818f3d8cef2e88e71cf96ffbe454a15b416fa3d7de9e54dcd85b29d1dfd11

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