Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f4d6a4d24bd1b8d…

MALICIOUS

PDF

83.9 KB Created: 2021-09-17 19:19:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e5cfc6af5172b451895219587f0a3f24 SHA-1: e5a1b7662f7249d5205a95d593ffd6b61a524dfd SHA-256: 2f4d6a4d24bd1b8d57e4bf1d7118f610cd498acad6d5286aae379d98ab300739
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. The presence of a 'download button' heuristic further supports a deceptive workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • 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 https://calienglish.com/ckfinder/images_store/files/17226392635.pdf In PDF document text
    • http://onishi-kyosendo.jp/archive/bajiwaba.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613925aa7c17d---jukerimig.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/laredokisefikut.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f225a24585---45610917456.pdfIn PDF document text
    • https://efsanepin.com/calisma2/files/uploads/bixeputob.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/rijuw.pdfIn PDF document text
    • http://frickcontrols.com/uploads/files/keguwasukomezo.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/15500323068.pdfIn PDF document text
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/33903443210.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/4353769292.pdfIn PDF document text
    • http://daiduongmetal.com/uploads/ckfinder/files/bibizopegawusaxosibategen.pdfIn PDF document text
    • https://thietbixaydungcantho.com/canthomobile2/public/images/sanpham/files/vobolewewotikivelofobu.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/60800160473.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/49308406608.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/jubuxexakebatudevig.pdfIn PDF document text
    • http://12shio5.com/contents/files/xumemamuluzo.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/65870280664.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/mujozegujejikitusazefow.pdfIn PDF document text
    • https://cmoretv.com/userfiles/neporojuximepav.pdfIn PDF document text
    • http://severstroysnab.ru/userfiles/file/gerazukozibotabo.pdfIn PDF document text
    • http://aotwresort.org/ckfinder/userfiles/files/zakupinemurasi.pdfIn PDF document text
    • https://vienhung.com/webroot/img/files/19945087223.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/95554843234.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=malinowski+argonauts+of+the+western+pacific+pdfPDF 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_off0000de15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE15 11168 bytes
SHA-256: 8b54f1e3c81c2d3875a1680214c9890dba3c8a2a0de83727afd914fe9479e734
font_01_sfnt_off0000f805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF805 19120 bytes
SHA-256: b25da532665afaa1af0677a7d62538dbcaa7ae36a4880f0a0dff4b2b13d43aab
font_02_sfnt_off0001298d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1298D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1