Malicious PDF — malware analysis report

Static analysis result for SHA-256 15aab749c5cad080…

MALICIOUS

PDF

72.4 KB Created: 2021-09-27 03:27:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 67df4d163776f1c19a642207af735ba0 SHA-1: 79f2c69498352da02f005cb5e53f0d0a4036ffb2 SHA-256: 15aab749c5cad080b5641b779994f71e35b2594ec9a2fb0774429589db33f42a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are structured as a link farm, suggesting a phishing or malware distribution attempt. The document body is heavily obfuscated and unreadable, but the presence of numerous links and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://kiuruvedenlukio.fi/tiedostot/file/63772546460.pdf In PDF document text
    • http://casaatlantida.com/userfiles/file///rutegomekofik.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/bobofuvimokotugisudisotov.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/229614215.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/gomajekiduzuzomudib.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613d120d09c97---xumuwoneba.pdfIn PDF document text
    • http://gs-metals.com/filespath/files/20210924040552.pdfIn PDF document text
    • https://zenmobile.in/jaipriyart/uploads/files/xifepusig.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/novoxokivutufax.pdfIn PDF document text
    • http://suncitygroup.ir/basefile/suncitygroupir/files/xivinotiramegifafu.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/dalesimafirikelix.pdfIn PDF document text
    • http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/dozetevabijefigetifu.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/39790025687.pdfIn PDF document text
    • https://novinfasteners.com/userfiles/file/bixogoxiwugimug.pdfIn PDF document text
    • http://kahasat.cz/data/file/97652240583.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/zasexawajuxonozatunut.pdfIn PDF document text
    • http://musicincw.com/fckeditor/userfiles/image/23702027379.pdfIn PDF document text
    • http://jvcc.cn/ckfinder/userfiles/files/2109071837218649373sd21.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/vulegabativok.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/43817879277.pdfIn PDF document text
    • http://bfttacg.marketsearching.com/upload/files/32386666854.pdfIn PDF document text
    • http://vertex-decor.com/userfiles/file/ripumuwigifovogoj.pdfIn PDF document text
    • https://rainwater.cc/images/uploads/files/19980380906.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=oxford+handbook+of+clinical+dentistry+7th+edition+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_off0000b44b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB44B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC62 11184 bytes
SHA-256: 82f38e74890b689451f14818b28b2408138b8007d79f88567bd7883fbf87de7b
font_02_sfnt_off0000e69f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE69F 17316 bytes
SHA-256: b9424d56088a90243c0c9e7dad5142f8acc2445d5235b3cd08523dc173c9909c

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