Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c832560e92620cd…

MALICIOUS

PDF

77.9 KB Created: 2021-02-26 15:48:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d7b008902caa031b2ddfc672d53b31fb SHA-1: e33ef055df7b27d4239c631ac9534cafeb87bf20 SHA-256: 3c832560e92620cd9c625e2992ecf26e080adbcc314df79584b5edfe287c94c5
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to attract search engine traffic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, contains text related to checking Airtel net balance, suggesting a lure to trick users into visiting the malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ponafet.ru/wix?keyword=how+to+check+airtel+net+balance+code
    • https://repawuwo.weebly.com/uploads/1/3/5/3/135313919/mewirukirirawe_zivezajitulo_pumonovaz_dogunavi.pdf
    • http://xuvaxujogilo.mygamesonline.org/what_does_ellipses_mean_in_texting.pdf
    • http://indohealth365.online/vutigelan38exv.pdf
    • http://zoosalon.org/excel_quotation_template_with_database3awfn.pdf
    • https://jorojesa.weebly.com/uploads/1/3/4/8/134861508/xozakotonuj_pemukibonifo_risisob.pdf
    • https://rofosuvobatijam.weebly.com/uploads/1/3/4/6/134661532/9679766.pdf
    • http://lnstagram-blue-badge-form.com/rollercoaster_tycoon_world_story_modeqgmsf.pdf
    • http://icub.tech/eia_weekly_report_schedulemxtop.pdf
    • http://freshmind.net/fisisikowasix5gebn.pdf
    • http://max-lifting.store/506944827728m3jl.pdf
    • http://copyrightsupportforlnstagram.com/kohler_20kw_generator_owners_manuale17um.pdf
    • https://cdn.sqhk.co/zidexamuwela/khaohgn/indoor_parkour_gym_nyc.pdf
    • http://axacheat4.xyz/cartoons_in_englishgscib.pdf
    • http://xuzekamusudis.iblogger.org/xinegar.pdf
    • http://sipipewawezizuf.getenjoyment.net/the_secret_rhonda_byrne_movie_online.pdf
    • https://cdn.sqhk.co/kigakikijebo/bP9giD4/zigetesuso.pdf
    • https://xowuxuwakewobi.weebly.com/uploads/1/3/4/8/134853014/e26a3c0887.pdf
    • https://vogadebu.weebly.com/uploads/1/3/4/7/134723944/zagebizew-suwejope-dobedutafedat.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nejesezape.myartsonline.com/what_is_sociology_and_anthropology.pdf
    • http://xatesowogexiwu.epizy.com/chef_d_entreprise_formation_professionnelle.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_off0000f48d.bin
c24833ffc29d55fd82111e4415afa54ee606feb5ca520b52a3af6ff8814c5e4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF48D 5104 bytes
font_01_sfnt_off000105ee.bin
8a4903d811cb1976b22cd36f075ecef2591484d482a828f6062e8795904bbfbc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105EE 10624 bytes

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