Malicious PDF — malware analysis report

Static analysis result for SHA-256 97bfee5175893924…

MALICIOUS

PDF

73.3 KB Created: 2021-09-20 06:55:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2b742fec4d8597e52b78bfe088c414ba SHA-1: de7350f2f5bea3a22dbff7739c661bdb85eae00f SHA-256: 97bfee5175893924f2230765cad72796bb633002034254263ecc39f6058df2a6
154 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or delivering malicious content. The presence of external URIs, including one pointing to a raw IP address, suggests an attempt to redirect the user to a malicious site. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://cyberbirddog.com/userfiles/files/kidas.pdf In PDF document text
    • https://sibois.eu/userfiles/file/17183264344.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/vabojev.pdfIn PDF document text
    • https://prospr.fr/ckfinder/userfiles/files/watokutupijekiseza.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/79533814899.pdfIn PDF document text
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/4206689438.pdfIn PDF document text
    • http://www.sainteuphrasia.com/www/js/ckfinder/userfiles/files/9715968562.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/xotulebetupezud.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/18884030525.pdfIn PDF document text
    • https://leanuslab.com/UserFiles/file/xinoreteminawun.pdfIn PDF document text
    • http://emblem4home.com/UserFiles/Member/File/wuxujisetajexemo.pdfIn PDF document text
    • http://studiomanzetti.it/userfiles/files/18219631448.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141c18f23033---jupizunib.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/getejosovaneporotan.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/wafuvuwifutofemik.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/13962456714.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/2128286543613af3a619a0d.pdfIn PDF document text
    • https://myshalewell.com/userfiles/file/20607260327.pdfIn PDF document text
    • http://ficfart.org/userfiles/file/8006194228.pdfIn PDF document text
    • https://pagodatalk.com/_UploadFile/Images/file/getej.pdfIn PDF document text
    • https://siliconautomation.com/userfiles/file/jowovepikaxunebav.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16133e3890700e---bazivobum.pdfPDF link annotation
    • https://sunpower.lv/ckfinder/userfiles/files/14965213099.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4a43564c2---wuminudevax.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/22302224326.pdfIn PDF document text
    • https://eko-briketes.lv/userfiles/files/53313162431.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=sonic+exe+mania+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_off0000b917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB917 18048 bytes
SHA-256: 30637a787b953f9c10ae4cebf366d40f956319dafd9f58e8a1e1c8c6678181c3
font_01_sfnt_off0000e858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE858 10392 bytes
SHA-256: 62513c8755c1fa946f2f43e0f221fd27d82c6b724e4b32f5c53f6f36852fdf48
font_02_sfnt_off0000ffe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1