Malicious PDF — malware analysis report

Static analysis result for SHA-256 c04ed1c88411f919…

MALICIOUS

PDF

75.0 KB Created: 2021-09-18 22:03:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d29fd7bc9eb7c7d703d3fc1291d2aadd SHA-1: 0ccae4bd3ced5c876200c61d8bc8494336683544 SHA-256: c04ed1c88411f919d1ab44cbe0c5f54392fbec15bf6e048b1ecb3a9521352841
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to disposable domains, characteristic of a link farm designed to obscure the ultimate destination and potentially deliver malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, suggesting the document's purpose is to redirect users to download files from these numerous, low-reputation domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://yibetter.com/data/files/nijufil.pdf In PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/31769853959.pdfIn PDF document text
    • http://azstorestudio.com/uploads/files/finofifelerijunujoz.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/xizolamof.pdfIn PDF document text
    • http://ros-audit.com/i/up/file/fasuwigokedul.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gujiwibijapig.pdfIn PDF document text
    • http://varvshistoriska.com/file/nujulaweb.pdfIn PDF document text
    • https://pre-www.bridge-college.com/uploaded/ckeditor/files/34973582024.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/87286926345.pdfIn PDF document text
    • https://vicareyou.com/userfiles/file/85164733871.pdfIn PDF document text
    • http://flex-link.cn/uploadfiles/files/wusonav.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/82481176724.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/ranizipefudire.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///jatij.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/1tgkngtgvvq1msnt1lr421r4a5/89198343200.pdfIn PDF document text
    • http://verypool.cn/images/upload/File/35443051351.pdfIn PDF document text
    • http://kondicionery-fryazino.ru/upload_picture/file/43240549333.pdfIn PDF document text
    • https://kocgrafikavukatwebsitesi.demowebsiteleri.com/upload/files/39926250777.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/kekuxetodigasururusotodu.pdfIn PDF document text
    • http://copy-office.it/userfiles/file/81763801364.pdfIn PDF document text
    • https://derya.afmiletisimajansi.info/resimler/files/pixejupeduwejajerox.pdfIn PDF document text
    • https://perfecthospitals.org/ckfinder/userfiles/files/51631533631.pdfIn PDF document text
    • http://vako.vn/app/webroot/uploads/files/galil.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/1lr56rqfo1r5enmknc8l9sj4kf/pizawixugenigewam.pdfIn PDF document text
    • https://durimawar.com/contents/files/semuzalewinomaz.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/jufudarogipiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=avp+apk+free+downloadPDF 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_off0000c40b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC40B 10356 bytes
SHA-256: 8adc25f567186a057006f2ea28ebbab6f98924754081be6095a52faeb87e1f51
font_01_sfnt_off0000dba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B6 16268 bytes
SHA-256: 294b30f251635191d2d2f3d225354653947b43bf9beb28ccb640a00ad19a43f6