Malicious PDF — malware analysis report

Static analysis result for SHA-256 32cccf52a9a9156b…

MALICIOUS

PDF

81.8 KB Created: 2021-09-15 16:49:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5019397fbe32604996ff2ef196a36002 SHA-1: 7fc83fc3771aa971d6bb9c648e50ddb68522af48 SHA-256: 32cccf52a9a9156bd4f31bda738a2322434643e2cb4a368bcf3b12cd2f88e42b
126 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to a link farm, indicating a likely SEO poisoning or content distribution scheme. The PDF structure and embedded content suggest it's designed to exploit vulnerabilities or trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://royal-pizza.eu/files/file/nubesofaterelufigidu.pdf In PDF document text
    • http://xn--72c7caerxx0d3a9eve.com/UserFiles/File/rewiwopita.pdfIn PDF document text
    • https://tinnituskozpont.hu/files/99072635663.pdfIn PDF document text
    • http://tetobox-budapest.hu/uploads/files/22029959668.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/24056816080.pdfIn PDF document text
    • http://roletyhanarol.pl/files/file/vudijesujatonegopogepafur.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/74704799827.pdfIn PDF document text
    • http://shopphutungmayphat.com/upload/img/files/boxukuvaxaseruka.pdfIn PDF document text
    • http://lobi.md/userfiles/file/reboxeduzubosilemopozor.pdfIn PDF document text
    • http://av72-reklama.ru/userfiles/file/16305762918749d716ba1ac9121cc1.pdfIn PDF document text
    • http://mybed.tw/uploads/files/202109131950404408.pdfIn PDF document text
    • https://whitesal.com/data/images/file/5488_20210915215540.pdfIn PDF document text
    • http://htcable.cn/d/files/99768380143.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202109121846446182.pdfIn PDF document text
    • http://dailynewsodia.com/assets/ckfinder/core/connector/php/uploads/files/gexofujobuvulib.pdfIn PDF document text
    • http://it-hair.com/userfiles/76053016846.pdfIn PDF document text
    • http://cmtl.in/uploads/userfiles/file/file/mebefibolomuwedavarazalok.pdfIn PDF document text
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/kodewasozomuxabepo.pdfIn PDF document text
    • http://www.ecrivains-consult.fr/easyonline/ckfinder/userfiles/files/nazikisojusekagurotej.pdfIn PDF document text
    • http://uniondrygoods.com/fckeditor/userfiles/file/widadotubewelatuduwok.pdfIn PDF document text
    • http://aotwcasino.com/ckfinder/userfiles/files/6500918117.pdfIn PDF document text
    • https://manorhair.com/uploads/files/202109022019559855.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/64024160193.pdfIn PDF document text
    • http://61kidsclub.com/userfiles/file/45997498858.pdfIn PDF document text
    • http://silver.jo/ckfinder/blanc/files/zolisuwofawejavixo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=mastercraft+new+multicraft+2020+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_off0000da41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF253 17244 bytes
SHA-256: dd62af3c0e62ee016db69437884d12ef083a425abbc459fcfd5f7c07ef66e86e
font_02_sfnt_off00011f6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F6D 11036 bytes
SHA-256: d6ca36bdb42a42ac441263f85878c4a5e0965ba081712cd24301944427f6792d

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