Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae7b939121f5f89c…

MALICIOUS

PDF

83.8 KB Created: 2021-09-22 10:07:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a58c2e5b00cde3fc13ef4f26a3b5f5c5 SHA-1: 8179b770b59763baf940de7d7c02c8c1cac82a2b SHA-256: ae7b939121f5f89ccfbba00145ae4517f966696cfeadb4f4d8a93e3f1b674e7f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further suggests a social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://philabc.ru/uplcv?utm_term=dosti+old+full+movie+download+480p PDF link annotation
    • http://humanlitech.com/files/files/71205436800.pdfIn PDF document text
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/65624997903.pdfIn PDF document text
    • https://nepaltrekkinginhimalaya.com/assets/userfiles/files/ramegeduwawizisanexo.pdfIn PDF document text
    • http://1day2night.com/UserFiles/file/31520927814.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/lipomixerapibada.pdfIn PDF document text
    • https://vatlieuchongnong.baohohoanglong.com/userfiles/file/jutojikan.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16136205db2c40---tizenumosibogal.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/zaravexofinenozakafiz.pdfIn PDF document text
    • http://vladekoservis.ru/files/bozaxukusijegaratogomaz.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/98052055504.pdfIn PDF document text
    • http://chanakol.com/ckfinder/userfiles/files/50076270130.pdfIn PDF document text
    • http://at2apigroup3.com/contents/files/41847321376.pdfIn PDF document text
    • https://securitydm.net/slicice/file/dugezigulagalu.pdfIn PDF document text
    • http://marketingnews.fr/images/file/56616568648.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/tilazovafab.pdfIn PDF document text
    • https://phr4u.com/files/77278515704.pdfIn PDF document text
    • http://leprofit.ee/cmsfile/contentfiles/57877257076.pdfIn PDF document text
    • https://xn--q3cceuw0c6ab0d2ii.com/upload_file/files/90138084027.pdfIn PDF document text
    • http://sentai.cc/data/file/20210906_234634_260.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/kokanetulunuwebimajoguto.pdfIn PDF document text
    • http://manuale.aziendasulweb.it/userfiles/files/nuvewozuro.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/wowinawadafe.pdfIn PDF document text
    • http://architettomontanino.eu/userfiles/files/20438455661.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_off0000e1d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D5 11220 bytes
SHA-256: c780d61906dbfd0f575eae19541aeb6468ab989db7fa34363118c9d64a104967
font_01_sfnt_off0000fc32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC32 17824 bytes
SHA-256: 5bb93a37743179a3e329286b7499eed260cce67f93da4a5cf7bfcb23ca378010
font_02_sfnt_off000129c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1