Malicious PDF — malware analysis report

Static analysis result for SHA-256 00791ad874f48901…

MALICIOUS

PDF

82.4 KB Created: 2021-09-08 22:01:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 0b52db6b5251aae676f511e7b1feea5f SHA-1: 7de985f6d0b7c20a058c9d862531d0b1d567d161 SHA-256: 00791ad874f489019074fe0dfef065586f07062141337480500ecdb6bd43b9e4
134 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, many pointing to disposable domains, suggests a link farm or redirection mechanism designed to trick users into downloading further malicious content. The 'SE_DOWNLOAD_BUTTON' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://dieutrimun.myphamkangnam.vn/webroot/img/files/wepekesoxuziz.pdf In PDF document text
    • http://ccadl.com/files/20210901063215.pdfIn PDF document text
    • http://ottuk-e.org/userData/board/file/59919869243.pdfIn PDF document text
    • http://csc-0411.com/userfiles/file/20210905193113_bl7db7.pdfIn PDF document text
    • http://seritour.com/rsm/files/54480207197.pdfIn PDF document text
    • https://callmarkinvestments.com/callmark/files/28019011030.pdfIn PDF document text
    • http://jafra-com.at/userfiles/file/55493907207.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/4565877607.pdfIn PDF document text
    • http://saigonford3s.com/uploads/2021-09-01/images/files/48893148190.pdfIn PDF document text
    • http://popmetre.com/news/files/81268638166.pdfIn PDF document text
    • http://sutipatika.hu/userfiles/files/32354940714.pdfIn PDF document text
    • https://euchebnici.com/img/file/fimujipuma.pdfIn PDF document text
    • http://patrickstaxi.fr/userfiles/file/migebite.pdfIn PDF document text
    • http://madurastones.com/userfiles/file/50522460718.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/xemolidatemuguworojidoliv.pdfIn PDF document text
    • http://steinemann-ag.ru/wozufigis.pdfIn PDF document text
    • http://vucert.vn/uploads/files/49540586163.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/77597835817.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/49861751628.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/cf955117e8d3a257c6fc7da480afcb63/fosunamelajebebososigokez.pdfIn PDF document text
    • http://spakimthi.com/upload/files/80597771889.pdfIn PDF document text
    • https://salwangurugram.com/files/worulawiwelukozez.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/75616548444.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16134148d9cf26---11850844538.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/xuvanofawuluzor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=sonic+runners+adventure+download+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_off0000ddd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD0 17200 bytes
SHA-256: 6d8b126642c22284bcdf2e81402011e659c084de08b7d7c2f7f052534992e0d6
font_01_sfnt_off000109ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12205 10924 bytes
SHA-256: 16056e760229e1feda57119447ae97ee77d7ea5156f8ba582dc82177de48fd54