Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0a88c5bcd473ce1…

MALICIOUS

PDF

76.2 KB Created: 2021-03-06 09:00:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 6f10f8fcb29d17d99269a4e96f3d941b SHA-1: 8182e9553c4b8572f79b4b5d12172684d5771565 SHA-256: e0a88c5bcd473ce1fca0d1d3839abeddbb648c68276c68d1e937946d11e102eb
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or redirection mechanism. The document body, though heavily obfuscated, appears to be a lure related to 'Ap biology reading guide chapter 25', indicating a social engineering pretext to drive users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://zajinet.ru/wix?keyword=ap+biology+reading+guide+chapter+25 PDF link annotation
    • http://gajaxujifusokul.mygamesonline.org/dorian_gray_book_review.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384160/normal_600772dd3177b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479902/normal_5fe80d5e2830e.pdfIn PDF document text
    • http://mitedujonajezed.scienceontheweb.net/how_long_do_honda_fit_batteries_last.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471252/normal_60241cc475819.pdfIn PDF document text
    • http://newoxoxi.mywebcommunity.org/66986592986.pdfIn PDF document text
    • http://moditem.22web.org/blender_beginner_tutorial_1_4_blocking.pdfIn PDF document text
    • http://vaxuserinux.22web.org/actiontec_wcb3000n_fios.pdfIn PDF document text
    • http://poxumanavofeboz.scienceontheweb.net/xexetivoludipepibaxibexi.pdfIn PDF document text
    • http://xuwuvewisin.mypressonline.com/66474487476.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367296/normal_6009c280ee1fe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://86b7bb9a-6a0b-496c-a062-e8aa60c365d0.filesusr.com/ugd/dcf311_d2e96eef495e4fc391303752b99c8094.pdf?index=trueIn PDF document text
    • http://tenurusimuxu.epizy.com/81915994728.pdfIn PDF document text
    • http://dasetalolup.epizy.com/gunubojutedeguzagar.pdfIn PDF document text
    • https://f4dd034e-00c7-465c-b850-fb2d75accad5.filesusr.com/ugd/769f78_4c331ba5cde14c96867d48ee92924091.pdf?index=trueIn PDF document text
    • http://rumapipenuwiwo.rf.gd/labumudig.pdfIn PDF document text
    • http://kixexagejo.epizy.com/tajiwibupexuvoziloru.pdfIn PDF document text
    • https://32cf4326-ba62-484c-a3ca-05d02c2dd2e5.filesusr.com/ugd/0b46e6_d1c3f954044a4f90b2b54c886d6e184c.pdf?index=trueIn PDF document text
    • http://kegunujav.epizy.com/divuvolar.pdfIn PDF document text
    • http://merovuditipin.onlinewebshop.net/60149599190.pdfIn PDF document text
    • http://nupuzawov.onlinewebshop.net/73638083985.pdfIn PDF document text
    • https://cfd9d48e-6ff2-4777-92b7-2545239058cc.filesusr.com/ugd/bcd086_040ed352426c41a6a5b54a7fa24c54fd.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_off0000e068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE068 5644 bytes
SHA-256: 7469a25b4e23b4585049d1d5be7f628f9ed8086bc51e4558cfaea5842e6c8ca0
font_01_sfnt_off0000f39a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39A 15348 bytes
SHA-256: b36af864bc66b6dd2b8229691b1416151884f5bb887ebf3cbf7a13a3f9b6925b

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