Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9a1f3b374f63c13…

MALICIOUS

PDF

80.4 KB Created: 2021-09-24 00:20:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: da538fc19a5f511d44f9bd8e6681eed3 SHA-1: 69ea60c66181232fb7b787868e00c803bd847a0c SHA-256: d9a1f3b374f63c136b5be76aae18b593ad0581dfd60062273d1708187d7f167b
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple links to external URLs, many hosted on disposable domains. One heuristic specifically identifies the PDF as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature, likely leading to the download and execution of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 https://garglob.ru/uplcv?utm_term=how+can+i+use+my+sd+card+as+internal+memory+in+android PDF link annotation
    • https://duvanco.be/docs/files/kemefa.pdfIn PDF document text
    • http://ambulatorioveterinariocigliano.com/userfiles/files/71856898298.pdfIn PDF document text
    • http://bangladeshceramicsociety.com/uploads/editor/files/bipewuxiwijagivanafiriwen.pdfIn PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/7085972776.pdfIn PDF document text
    • http://domuran.pl/files/file/58881166826.pdfIn PDF document text
    • http://pickup-ws.com/userfiles/files/72197107911.pdfIn PDF document text
    • http://mascotdd.com/file_media/file_image/file/riwoxafuzodigekolino.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/98026003826.pdfIn PDF document text
    • http://mayepnuocmia.vn/data/ckfinder/files/46102601040.pdfIn PDF document text
    • http://nenayu.com/filespath/files/20210920004338.pdfIn PDF document text
    • http://maxgear.cz/webpagebuilder/ckfinder/userfiles/files/76085403465.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/41242493935.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/59aa659bbdc177e60b765f312632eb6d/bepusiriraxutedif.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/xesamebinoxukunut.pdfIn PDF document text
    • http://severstroysnab.ru/userfiles/file/gatodabuwizetur.pdfIn PDF document text
    • http://novo-foto.ru/ckfinder/userfiles/files/2289409266.pdfIn PDF document text
    • https://tommytest.dish1314.com/data/html_editor/files/zanalavoreriwuwen.pdfIn PDF document text
    • http://unityproductions.com/upload/files/91089226428.pdfIn PDF document text
    • http://chia4kids.ru/ckfinder/userfiles/files/38514765810.pdfIn PDF document text
    • https://geya99.com/ckfinder/userfiles/files/bezexiwikajadizi.pdfIn PDF document text
    • https://halead.com/uploadfile/1631413826.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/fodipepames.pdfIn PDF document text
    • http://kingsbrite.com/kingsbrite.com/userfiles/file/susokawe.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_off0000d65a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD65A 16788 bytes
SHA-256: caa932420d1b4bed67a20c6e344226e4a6d28f68f8109ab50d6707d1374c8ed0
font_01_sfnt_off0001023b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023B 10824 bytes
SHA-256: 47ad13ce59f511934c076f20b21fa68e3553c9e0ad18608d8df5587cfd85b6d8
font_02_sfnt_off00011b3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1