Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0f5486e1d7d48ca…

MALICIOUS

PDF

78.6 KB Created: 2021-09-14 11:01:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8e119a9519805741db464c896c29e8b4 SHA-1: 2afb585df4d682c595f3b2220c5d56dc30d29c51 SHA-256: f0f5486e1d7d48caa7039a267de252860980b1e56f9c7663ffa8f599b221f781
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to various domains, a pattern indicative of a link farm designed to obscure the ultimate destination or spread malicious content across multiple sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://fsreloading.com/userfiles/files/41830624380.pdf In PDF document text
    • https://tiguan-wiki.ru/file/lasasit.pdfIn PDF document text
    • http://jjc-dev.com/userfiles/file/58760820946.pdfIn PDF document text
    • https://liepasmuiza.lv/userfiles/library/4415455067.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/1832022498.pdfIn PDF document text
    • http://nuklearmedizin-amro.de/userfiles/file/17787418286.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/551087889.pdfIn PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/savimuzejutivufiza.pdfIn PDF document text
    • http://hanyuchina.com/upload/files/vigebaguguguzu.pdfIn PDF document text
    • http://dsagco.com/Upload/file/nokazugafabenu.pdfIn PDF document text
    • https://forumhrdbekasi.com/webroot/userfiles/files/xuworopinibomirefugabukol.pdfIn PDF document text
    • http://penzion-u-zamku.cz/files/file/bubunajawawupubomojenag.pdfIn PDF document text
    • http://dekobonner.de/userfiles/file/bagoxonopobelekajajilara.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/nakuvikiruraj.pdfIn PDF document text
    • http://st-communications.com/ckfinder/userfiles/files/28158809166.pdfIn PDF document text
    • http://www.saletime.gr/admin/fckfiles/file/81645771270.pdfIn PDF document text
    • http://thegioichuyendong.info/app/webroot/upload/files/88634240977.pdfIn PDF document text
    • http://locnuocvietmy.com/Images_upload/files/78049791362.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16135141fe9c6d---88027124846.pdfIn PDF document text
    • https://hung168.tw/UserFiles/files/34944149808.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=bmg+drive+for+androidPDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/96338181298.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_off0000d1b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B6 10504 bytes
SHA-256: 680d34e3080483040c32dd4fea4f6173676c084a42c928ac4a535b60d4140562
font_01_sfnt_off0000e95e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95E 17056 bytes
SHA-256: a78a49456da4ce9154081972c3a2a928ac21f4d07555dea518d54d9180c4736a
font_02_sfnt_off000114e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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