Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a86907bd02d957f…

MALICIOUS

PDF

72.8 KB Created: 2021-09-16 02:46:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e70e8735e1746ee3edb4f1bdfb27d66c SHA-1: 27e935ea4bdf2374e9222200177f24bed1bb34fc SHA-256: 5a86907bd02d957f6e2484ae764badb38264b789488a6b9564dddb8808b07999
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URIs, many of which point to disposable hosting and utilize UTM parameters, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document, likely serving as a lure for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://allytemp.ru/uplcv?utm_term=monster+dash+mod+apk PDF link annotation
    • http://hvezda-pardubice.cz/files/file/xekuxokekuseriwakutupumi.pdfIn PDF document text
    • https://rawoctane.com/uploads/file/85032972584.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/seteguwamekudexazimomel.pdfIn PDF document text
    • http://fohow77.ru/upload/file/56887018227.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/42978463938.pdfIn PDF document text
    • https://ismet.com.br/ckfinder/userfiles/files/virakakulaledumubedojaj.pdfIn PDF document text
    • http://qlinairnv.be/userfiles/file/bubuvowazenamizipazum.pdfIn PDF document text
    • https://hse.tw/upload/file/sogilaxoxojifejuvoxurores.pdfIn PDF document text
    • https://anitt.in/ckfinder/userfiles/files/88265268900.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/rolevinusebiwituxibenupo.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/jukisa.pdfIn PDF document text
    • https://maria-galland.ru/files/file/84862696508.pdfIn PDF document text
    • http://ashole.hu/UserFiles/File/pasisopenenipokulifiwepe.pdfIn PDF document text
    • http://eksternest.be/images/file/21761825761.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/b2v3tq8hu5sbuvb2g5q97fj570/rasokibakapupaluvabuzanoj.pdfIn PDF document text
    • https://samsungklimamodelleri.com/upload/ckfinder/files/figezumenarigoxe.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16130dd5d4dcfb---34463527668.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/lovajesejosuboki.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/13312781146.pdfIn PDF document text
    • http://kbautotech.com/board/datafiles/imagefile/dojaketimojajorugivi.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210905_AD84BE586D66007C.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/masutenasixusijadiduwusi.pdfIn PDF document text
    • https://lenaoyunlar.net/calisma2/files/uploads/tixososotobizage.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/67302235314.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/92525272688.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b5f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5F8 10604 bytes
SHA-256: 4cc53aedf9035df0952c5be875fc71a81d72fd4d8baa2d45ab040010f0288db1
font_01_sfnt_off0000ce01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE01 19096 bytes
SHA-256: 2b7118a9c28b2e447ee6d140388a6f30992cc9113f6e71bca33bb3ca47d9370c
font_02_sfnt_off0000fde4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1