Malicious PDF — malware analysis report

Static analysis result for SHA-256 327527d1a75bdc6e…

MALICIOUS

PDF

77.4 KB Created: 2021-02-25 23:53:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9e3e852ef3720ebf84abd06b5a2e40e1 SHA-1: 762ac074f2e087e14c3332d1b09f91fae819992d SHA-256: 327527d1a75bdc6eeaf3f23ccd916ad59c9c528af3b0beb95fa185f292182a4e
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and a heuristic identified it as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though partially corrupted, references 'skirt patterns', suggesting a lure to disguise the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/strik?utm_term=so+sew+easy+skirt+patterns
    • http://reduslim-siteofficial.site/1513068328541hzd.pdf
    • http://jikusofare.mywebcommunity.org/ranco_fridge_thermostat_adjustment.pdf
    • http://instapriz365.online/using_econometrics_a_practical_guidek89vc.pdf
    • https://cdn.sqhk.co/vomofizog/KQSgink/290635026.pdf
    • http://technodom11.com/podesibeduzolezevageselx0sl.pdf
    • http://xsale.trade/hp_beep_codes_2_beeps_red_light75lhu.pdf
    • http://remastacer.com/soundcloud_music_macwnaau.pdf
    • http://sdorovie-sustavi.xyz/103438560209oprh.pdf
    • http://bikejesoxatelo.mygamesonline.org/ms_project_2010_user_manual.pdf
    • http://sawemawe.mywebcommunity.org/sofelububejomexasuzakiwe.pdf
    • http://xulubapatoso.scienceontheweb.net/balancing_equations_worksheet_answers_1-20.pdf
    • http://gagivukamuw.getenjoyment.net/the_lion_the_witch_and_the_wardrobe_movie_songs.pdf
    • http://jalazekesofijot.medianewsonline.com/luvuboduj.pdf
    • https://cdn.sqhk.co/panosiritu/whgEid5/dunabavijogutevuwekuseveg.pdf
    • http://7lessons.site/masipawozizobizcmmhq.pdf
    • http://all-host.site/the_westing_game_picturesf8r2u.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://piwakitidi.onlinewebshop.net/momanidolepinubijokex.pdf
    • http://wotidupodugi.myartsonline.com/how_to_solve_replace_toner_error_in_brother_printer.pdf
    • http://vejegaba.atwebpages.com/what_zodiac_sign_of_april_20_1982.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_off0000f2c5.bin
3e34a31172dc6af3a8b5990a2e487b271d2362abe5ba90bd0b8a3fe70a4b3cc8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C5 5140 bytes
font_01_sfnt_off0001046e.bin
18e972ed08780ead46943f36f41475572dfc1a3fb77505072ba2b6c9d22513d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1046E 10728 bytes

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