Malicious PDF — malware analysis report

Static analysis result for SHA-256 827862d09931eaec…

MALICIOUS

PDF

103.0 KB Created: 2021-10-07 19:52:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 31a319d3691f8bfec740d73d01ae5ff6 SHA-1: fe007046e31e5942a16953e4da7f17e1ef01bea8 SHA-256: 827862d09931eaec4065f66809321d506783594369b6ae192023d88c4e37e840
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, suggesting it functions as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 https://medvor.ru/uplcv?utm_term=excuses+to+get+time+off+work PDF link annotation
    • https://mitrasuksesku.com/userfiles/file/45360775139.pdfIn PDF document text
    • http://autothudo.vn/upload/fck/file/16958773760.pdfIn PDF document text
    • https://mimpiindah168.com/contents/files/banepozizupexoxolavu.pdfIn PDF document text
    • http://about-dogs.ru/upload/file/63141106168.pdfIn PDF document text
    • http://surveycook.com/upload/tmp/202109/file/29821385985.pdfIn PDF document text
    • http://aotem.com/data/home/qxu1780220113/htdocs/uploadfile/files/40062331298.pdfIn PDF document text
    • https://bandloc.sbchecks.com/FCKeditor/file/zugovanoluvonagu.pdfIn PDF document text
    • http://tzsunup.com/upload/4413892830.pdfIn PDF document text
    • https://nabsangram.com/userfiles/file/nofegotureka.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/97638003079.pdfIn PDF document text
    • http://photo-poligrafic.ru/ckfinder/userfiles/files/patojabezugefepupavorofo.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/45004805536.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/75992935200.pdfIn PDF document text
    • http://sireny.net/share/files/fanike.pdfIn PDF document text
    • https://widerbet.pl/userfiles/file/36187362171.pdfIn PDF document text
    • http://huntland.hu/upload/file/kosavilefisurivul.pdfIn PDF document text
    • http://stapper.de/sites/default/files/userfilesfile/57825341892.pdfIn PDF document text
    • http://rentaruedas.com/files/others/nabibelopakibutupar.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/89059897587.pdfIn PDF document text
    • https://martabaktelor.com/contents/files/kikulew.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/rupopogigibifajufaketus.pdfIn PDF document text
    • http://jezirka-biobazeny.cz/UserFiles/File/rozabagekaxejo.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5f2be1b23---putulaluk.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/14974737016.pdfIn PDF document text
    • http://imobiliariaimperio.com/files/files/fizerajatar.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_off00012a55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A55 19716 bytes
SHA-256: bccf7cd032d5677fc61d9c83ae7cbc9348bd083f44266b0cd9faee30a3167d9d
font_01_sfnt_off00015d6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17581 10728 bytes
SHA-256: d6827e883edd21fee25aa88e29786b375f57e12a63797747cc47eb30fee3915b