Malicious PDF — malware analysis report

Static analysis result for SHA-256 93613833de41230c…

MALICIOUS

PDF

83.0 KB Created: 2021-09-11 16:31:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c467a8667e3d023e61e48bf70ba55779 SHA-1: 1b4d286bc4fee718a2298894e5327ae0cf270abe SHA-256: 93613833de41230c582050a016517884bed62cbf1207ba8d3598516e409e6480
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of numerous external URLs, many pointing to disposable domains and flagged as a link farm, suggests an attempt to redirect users to malicious sites. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • 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.
  • 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://xn----7sbjvweekof5d.xn--p1ai/files/files/86776687764.pdf In PDF document text
    • https://www.corpeverest.com/ckfinder/userfiles/files/94680407072.pdfIn PDF document text
    • https://satbietthu.com/luutru/files/guworakidajamileveno.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/vowomidebunagowiwufopas.pdfIn PDF document text
    • http://getrade.net/uploadfiles/file/zuxotari.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/90360066112.pdfIn PDF document text
    • http://taihegas.com/filespath/files/20210904053406.pdfIn PDF document text
    • http://wdnederland.nl/file/nirewobavukozokipex.pdfIn PDF document text
    • http://regalmotors-jp.com/js/upload/files/5353513331.pdfIn PDF document text
    • http://king-ber.com/UploadFiles/file/20210903083256505.pdfIn PDF document text
    • http://mercuresamuichaweng.com/admin/file/vosomolozalurosibatil.pdfIn PDF document text
    • http://giteduguedesboires.fr/userfiles/file/jasikalovofetijitakig.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210909195854.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/16396827296.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/14507430538.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/rejewesifapi.pdfIn PDF document text
    • https://pavillonwohlen.ch/userfiles/files/93077295314.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/ditusevugizupoka.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/jixomadovakezifaxojabawig.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132bdc987a18---7443981835.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/wiranafolakagagugebelim.pdfIn PDF document text
    • http://hfengly.dk/skoleportalen/userfiles/file/vowujedevonatabu.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/75554087946.pdfIn PDF document text
    • https://inprovituruguay.com/ckfinder/userfiles/files/xasoxisafemimapofigevubig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+change+the+keyboard+theme+on+androidPDF 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_off0000dc8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8E 18500 bytes
SHA-256: 1a4731c3f5463aefbc06f7f1d49c0e1953a91c710144c09eb6d1a13a201508ff
font_01_sfnt_off00010cd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD7 11024 bytes
SHA-256: 58f2ce5d267bcd59c2aa0621bd6a97f86e7fdae8152fe001423f8b58706a9715
font_02_sfnt_off0001261d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1261D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1