Malicious PDF — malware analysis report

Static analysis result for SHA-256 12d9f5d69318f180…

MALICIOUS

PDF

76.5 KB Created: 2021-10-05 15:22:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: da02f98c9abba3d8ef2ced313e4fe6fc SHA-1: 99773e22066e3fd1e79f0f5e8e0156808a217e31 SHA-256: 12d9f5d69318f180035012183e51eefb25d17a2dd7529da50677e051db093b86
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, with many pointing to disposable domains and exhibiting characteristics of a link farm. ClamAV and an ML classifier identified this PDF as malicious, specifically flagging it as a phishing trojan. The presence of multiple suspicious URLs suggests an attempt to redirect the user to a malicious site, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • 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.
  • 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://kohphanganhotelandtour.com/userfiles/file/ridefowojumimuminolaz.pdf In PDF document text
    • http://spielundlicht.de/content_provider/documents/files/95653394914.pdfIn PDF document text
    • http://7sate.com/filespath/files/20210929153648.pdfIn PDF document text
    • http://aldobini.it/userfiles/files/radevimozarodujak.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/624c15fff6a9f677b6cf10237aff01b7/43097328045.pdfIn PDF document text
    • http://0048.pl/48files/file/sowesegofinu.pdfIn PDF document text
    • https://altaitur.com/ckfinder/userfiles/files/janefopaj.pdfIn PDF document text
    • http://reestr.fgosvo.ru/files/files/72026223074.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/8cn0dcpjqhqmd8paf5dstj302a/84468640410.pdfIn PDF document text
    • https://fminterativa.net/cms/plugins/ckfinder/userfiles/files/77144573365.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/80566129004.pdfIn PDF document text
    • http://metzlerranch.com/userimages/bubonedomobejexojuterave.pdfIn PDF document text
    • http://gardatrans.com/content/Files/vewate.pdfIn PDF document text
    • https://4wheelchile.cl/admin/uploads/file/remobenugotixafo.pdfIn PDF document text
    • https://ddc-touggourt.dz/ar/files/wazemexitot.pdfIn PDF document text
    • https://kingwrapcarspa.com/upload/files/9305298438.pdfIn PDF document text
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/binuloji.pdfIn PDF document text
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/58296522273.pdfIn PDF document text
    • http://goldenmallbiotech.com/upload/files/91504002723.pdfIn PDF document text
    • http://musicincw.com/fckeditor/userfiles/image/60880821162.pdfIn PDF document text
    • https://isigakizima.net/img/tmp/file/jalizorupatomijilo.pdfIn PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/51946585857.pdfIn PDF document text
    • https://acatay.daynexdemo.tk/upload/ckfinder/files/88414468997.pdfIn PDF document text
    • http://partnercable.hu/files/wufoguzuzigaxaxumamol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=example+of+not+exponential+functionPDF 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_off0000c432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC432 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC44 18100 bytes
SHA-256: e7975ca0948b599a9f7666b888ced108441d6444e610d876869791f3ddf65c31
font_02_sfnt_off00010be6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE6 10560 bytes
SHA-256: 5e0fd55cdbb90d10556c80922e9dbf360ee058451b027c85301325b6358d51f1