Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d90601a09dcce09…

MALICIOUS

PDF

75.7 KB Created: 2021-03-21 01:01:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e423d75edef226c0d895220b2ad15d57 SHA-1: 1d4b217128d9366eed9faf275dc92547c67ef967 SHA-256: 6d90601a09dcce0966a73ee8de0bbb3166d53ec2d6cfc8760113a8fe04f49b26
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. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically indicates a non-clustered link farm on disposable hosting, reinforcing the malicious intent. No scripts were extracted, but the presence of many external URIs suggests the primary attack pattern is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://soxebez.ru/wix?keyword=christmas+eve+liturgy+year+a
    • http://loveworld.club/34103073693gt3l5.pdf
    • http://profapp.pro/37842717721x35qu.pdf
    • http://warowusavi.mywebcommunity.org/case_for_a_creator.pdf
    • http://lenulari.mypressonline.com/30851688436.pdf
    • http://thepropheticapp.com/diastolic_dysfunction_european_guidelines9uoyk.pdf
    • http://fsfsfd.xyz/jenosuwobk5ow.pdf
    • http://pakekoramiduwin.getenjoyment.net/lasutuzukizitedebug.pdf
    • http://tixshopclub.fun/brother_mfc_j835dw_printere4orw.pdf
    • http://dayzcommunity.info/bulletproof_6.0_powerstroke_engine_for_sale_near_mebcpy2.pdf
    • http://dufazesiz.mywebcommunity.org/banking_and_financial_awareness_by_kiran_prakashan_free_download.pdf
    • http://fusekimutoxi.sportsontheweb.net/zeteberesurivagadodaxado.pdf
    • http://kesisofawa.mygamesonline.org/browning_hi_power_custom_wood_grips.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kiduxoz.epizy.com/zobixuf.pdf
    • http://viganoxoloni.rf.gd/pemeluvonikogasun.pdf
    • https://s3.amazonaws.com/luramamelolem/90510901706.pdf
    • http://dusegakalo.epizy.com/x1_box_stuck_on_boot.pdf
    • https://s3.amazonaws.com/bogeguva/myeconlab_homework_answers.pdf
    • http://fokerek.epizy.com/holmes_chapel_primary_school_uniform.pdf
    • http://zutaturusix.myartsonline.com/barunabewezuxo.pdf
    • https://s3.amazonaws.com/wesezuzuvalirik/79638214968.pdf
    • https://s3.amazonaws.com/tuzamada/kerigakedal.pdf
    • https://s3.amazonaws.com/befafuni/best_free_meme_generator_app_android.pdf
    • http://zuxulabawiba.rf.gd/el_caballo_de_troya_realidad_o_ficcion.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec7f.bin
b635456d01b103f270e794cc8638c9fbf7fdfbf894c404a13a5cff1f318bc105		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7F 5168 bytes
font_01_sfnt_off0000fded.bin
c3eb93706c929cc255ba8d6360252739db616179a228519e0374e0cb0f96f03d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDED 10444 bytes

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