Malicious PDF — malware analysis report

Static analysis result for SHA-256 a126fc716cda5b8e…

MALICIOUS

PDF

77.7 KB Created: 2021-09-27 17:43:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 84bf8281c2e7dc533a8976206bc282b9 SHA-1: 3c2f703da95fd9d6ce783ada9d3bee1138ea7ec7 SHA-256: a126fc716cda5b8e76a276679dad82e5052d29dc747b49ebc2c351f91d6fc16a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. The PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 5

  • 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.
  • 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://allytemp.ru/uplcv?utm_term=cricket+19+game+download+apk+for+android PDF link annotation
    • https://ruh-center.ru/userfiles/file/22684928768.pdfIn PDF document text
    • https://mediaget.ru/userfiles/files/woratezinek.pdfIn PDF document text
    • https://flexi-cms.com/uploads/file/vesetuzumix.pdfIn PDF document text
    • https://dallaslandscapedesign.com/media/files/25449171648.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/gafisisiruwuvo.pdfIn PDF document text
    • http://kencert.vn/uploads/image/files/46589783294.pdfIn PDF document text
    • https://medbillings.us/lightspeedweb1/file/jefidaw.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/76531502143.pdfIn PDF document text
    • https://jpt.mysmartedu.com/uploadimages/files/tiforewusawo.pdfIn PDF document text
    • http://nigerseedindia.com/uploads/30889013242.pdfIn PDF document text
    • https://penal-garazh.ru/files/widuvojosuti.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-27/20210927085834857375.pdfIn PDF document text
    • https://hkpefa.org/editor_upload/file/wosim.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/95356381573.pdfIn PDF document text
    • http://spzpoz-zdunskawola.pl/upload/file/88188701208.pdfIn PDF document text
    • https://alternatifhirdavat.com/upload/ckfinder/files/vemulevezuruzikegezumamaf.pdfIn PDF document text
    • http://avtosfera28.ru/userfiles/file/84212554539.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/kumiraw.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/31856369670.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/selod.pdfIn PDF document text
    • https://tahitotfalu.hu/ckfinder/userfiles/files/jemejaremit.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/78832684074.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/vavuzevusawujami.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_off0000c0a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0A9 11224 bytes
SHA-256: ba726065f6364d25f17521a4071da6acd6798a9833eb49eb684b3c9c84df559a
font_01_sfnt_off0000dae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE8 20784 bytes
SHA-256: 1a1178d5d5fdf0b4ee177432fb88d1197773f97681b7d56ecc54bfe4f58fb94c
font_02_sfnt_off00011144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11144 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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