Malicious PDF — malware analysis report

Static analysis result for SHA-256 9af6d997a1d67c6c…

MALICIOUS

PDF

82.7 KB Created: 2021-09-22 14:19:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 0e6739b6b111615409d436dd856da9c8 SHA-1: 43e8e4328b0b5a088a4be162980d30ececd1c581 SHA-256: 9af6d997a1d67c6ca1d64297401d2fd783825271e0f77a0471e79b46dc29814d
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for delivering malicious payloads. The heuristic 'ML_NYX_PDF_MALICIOUS' and ClamAV detection strongly indicate malicious intent. The presence of numerous links, including one labeled as a 'link farm on disposable hosting', suggests an attempt to redirect users to download malicious content, likely disguised as an ebook downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://ibshop.gr/uploads/_uploads/files/novise.pdf In PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/81505809157.pdfIn PDF document text
    • http://dhf-china.com/d/files/dixirujixipobuwafe.pdfIn PDF document text
    • http://xn--80aejmo0alc.xn--p1ai/ckfinder/userfiles/files/damugogaxisabobexibolu.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/68736006615.pdfIn PDF document text
    • https://agatanorek.com/files/file/puwuvirovovob.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/41677515214.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/57379244087.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/9498449233.pdfIn PDF document text
    • http://regiapart.si/uporabnik/file/filebivajobuvijetapeg.pdfIn PDF document text
    • http://purepassion.pl/userfiles/file/49689842453.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/mofufosuguzofazadeku.pdfIn PDF document text
    • https://nomaquito-travel.com/editor-images/39395975575.pdfIn PDF document text
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/99781610124.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/33020495397.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/wotetis.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/98086087871.pdfIn PDF document text
    • https://aldwalia.com/userfiles/files/18298259664.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/42228234950.pdfIn PDF document text
    • http://ramenhajimetustin.com/uploads/files/15506270738.pdfIn PDF document text
    • https://delta-relay.be/userfiles/file/nifabakojelituvu.pdfIn PDF document text
    • http://scuderia512.com/js/upload/files/26094532117.pdfIn PDF document text
    • http://snp-ent.com/files/fckeditor/file/2436816946136904b25f77.pdfIn PDF document text
    • http://acutecardio.ru/sadm_files/33380023611.pdfIn PDF document text
    • http://myrbacken.se/login/ckfinder/userfiles/files/33861232836.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=smart+ebook+downloader+apkPDF link annotation
    • 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_off0000deaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C1 17792 bytes
SHA-256: 13ab81bc0c6d053b130d96c2031062393f2d092e71cfc817e4d278f1bc63407f
font_02_sfnt_off000124a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A0 10688 bytes
SHA-256: d3d31b01751afbbf577eac9895b2ca8764f702f6052f2e9f4efb949371003380