Malicious PDF — malware analysis report

Static analysis result for SHA-256 69359fe9f781280d…

MALICIOUS

PDF

74.9 KB Created: 2021-02-23 23:34:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 25495d41e07142036b47b745ae878588 SHA-1: d452b9953177880835fd6cfecd2b5f5361449ff7 SHA-256: 69359fe9f781280d4c80511473b5e3c0c5ebff9ec0a87429f871a936e6f11666
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. One prominent URL, 'https://jottigo.ru/aws?utm_term=real+analysis+pdf+by+walter+rudin', is likely the primary destination for the attack. The PDF structure and embedded content indicate it's designed to trick users into clicking malicious links.

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://jottigo.ru/aws?utm_term=real+analysis+pdf+by+walter+rudin PDF link annotation
    • http://ontrade.top/jirerafapusaxageluwujin7rgcm.pdfIn PDF document text
    • http://gulexamotapa.iblogger.org/handwriting_name_practice_sheets_for_kindergarten.pdfIn PDF document text
    • http://gufutaca6.xyz/lopisuxogatifagukevmzisz.pdfIn PDF document text
    • http://majidadap.22web.org/olympus_om-1_without_battery.pdfIn PDF document text
    • http://yewes.space/problem_solving_approachgowvu.pdfIn PDF document text
    • https://cdn.sqhk.co/rubutemoxe/hjjiejg/halloween_wallpaper_4k_hd.pdfIn PDF document text
    • http://nout-prodat.site/7._0_frp_bypass_apkzowaw.pdfIn PDF document text
    • http://healthytrands.com/edukondalavada_venkataramana_govinda_govinda_mp3_free_downloadvyaa3.pdfIn PDF document text
    • https://toxosujaduwo.weebly.com/uploads/1/3/0/8/130874389/9642104.pdfIn PDF document text
    • http://blog-millionaire.buzz/pretties_scott_westerfelderu4t.pdfIn PDF document text
    • http://hookup158.fun/gutabiniluvvbucg.pdfIn PDF document text
    • https://tiramanab.weebly.com/uploads/1/3/1/8/131856622/5568045.pdfIn PDF document text
    • http://arboozfilm.com/xomuvegigabobo0gixk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://piwisivajefi.rf.gd/73435684939.pdfIn PDF document text
    • http://kizarepopudoso.epizy.com/gotuxogekavek.pdfIn PDF document text
    • http://kivevufawonin.rf.gd/zasodiju.pdfIn PDF document text
    • http://nowopuxi.epizy.com/arya_2_movie_in_tamil.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CC 5376 bytes
SHA-256: 7bde8a43e36d5362e5bb60b4d15eb884c3c6fa7cb70f5ad7553aff64162a49af
font_01_sfnt_off0000f742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF742 11652 bytes
SHA-256: 37089a31037878a6bbd664ef6399350e525547463830173aa9033629d6b5200a

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