Malicious PDF — malware analysis report

Static analysis result for SHA-256 a25ac07c0718bf03…

MALICIOUS

PDF

76.6 KB Created: 2021-09-26 09:25:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 333fa914748a925aae1b0578641ada46 SHA-1: 0da17e808563432ed248acfb35bacc953abebb6c SHA-256: a25ac07c0718bf030e062b7e68dee1d4f2f6ee6b9cd9809f5282497f75b44ec2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with link farms or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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=android+app+to+find+iphone PDF link annotation
    • http://kiajihlava.cz/UserFiles/File/tuzad.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16149e9e04587d---98848883702.pdfIn PDF document text
    • http://yugreat.com/filespath/files/20210911225211.pdfIn PDF document text
    • https://onlineadda.net/ckfinder/userfiles/files/14350773404.pdfIn PDF document text
    • http://bacsiha.com/public/ckfinder/userfiles/files/8746851959.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/dakuluwap.pdfIn PDF document text
    • http://pallenberg-busreisen.de/uploads/files/sivajagegepuwugugeve.pdfIn PDF document text
    • http://wwsm-us.com/files/file/fixadidisavinulibijel.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/26525459389.pdfIn PDF document text
    • http://monarchiaerembolt.hu/tmp/zebusuta.pdfIn PDF document text
    • http://benly-carson.com/product/files/63612848324.pdfIn PDF document text
    • http://djpress.pl/Image/files/14137941094.pdfIn PDF document text
    • http://wixoon.hu/upload/file/20311498502.pdfIn PDF document text
    • https://ojazzdance.fr/userfiles/file/tigesebopewileput.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/8029067376.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c5b7073dd---18343464135.pdfIn PDF document text
    • https://jogamiskolc.hu/ckfinder/userfiles/files/guliwebet.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/tujozibokemaju.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/xawaniguxedijinezawad.pdfIn PDF document text
    • http://bubb.cn/up_file/file/97071878356.pdfIn PDF document text
    • http://finchamauto.com/pics/38696262934.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/dowiferojupukinotefaxij.pdfIn PDF document text
    • http://sbkf.org/files/files/23619056434.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/19347507921.pdfIn PDF document text
    • http://architectureanddesign.it/userfiles/files/mirumez.pdfIn PDF document text
    • http://njuhome.pl/ckfinder/userfiles/files/25216031673.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_off0000c365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC365 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7C 10364 bytes
SHA-256: 4d7975f68bfc7a6b799dfcbf115a86b906c1a533e27ac40aeddf915eff84ed5d
font_02_sfnt_off0000f2c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C9 19332 bytes
SHA-256: a65a8bd35db30bfd30f6bdc3627e5ca6c3c51c9401f06e3b41f4cace67bed2d6