Malicious PDF — malware analysis report

Static analysis result for SHA-256 41a848573aa858ed…

MALICIOUS

PDF

78.6 KB Created: 2021-09-12 06:04:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8c252c6c2b671891c005651e40af7b29 SHA-1: 9abd621726555653d7da80436230aeb156b4d7ac SHA-256: 41a848573aa858ed67c6f8e86598a3168e8fb7aa2b4217c013882ecfe25d7db8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high number of external links, suggesting an attempt to distribute malware or phish for credentials. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.campacinter.com/image/upload/File/velifuferuliva.pdf In PDF document text
    • http://auto-spec.ca/fck/file/16190526057.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/pubelemadexojunabodajaz.pdfIn PDF document text
    • http://jnejendomsdrift.dk/userfiles/file/povezoso.pdfIn PDF document text
    • http://thayloilocnuoctaihanoi.net/upload/files/30865942676.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/kikudatoguputufumegaxofe.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/tiruwemefaruruxovapafusix.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16134f6cfbe3be---nezalit.pdfIn PDF document text
    • http://datong-travel.tw/upload/ckeditor/files/20210904215653.pdfIn PDF document text
    • http://dxline.eu/userfiles/file/82818563568.pdfIn PDF document text
    • http://theprofitnesstrainers.com/userfiles/file/motududofeporazoripe.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/58138771820.pdfIn PDF document text
    • https://riosemarescentrodemergulho.com/ckfinder/files/77063030374.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/zosobo.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/rukawurisawem.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/milukaponosikorudebaguri.pdfIn PDF document text
    • https://projectmine.hu/ckfinder/userfiles/files/sisisa.pdfIn PDF document text
    • http://sanyosushiglendora.com/uploads/files/85807700181.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/72qi2co4b1v3q3pqgevgibc74h/jerufekesulemesalan.pdfIn PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/73784392310.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/sajemisixisikevegupamulo.pdfIn PDF document text
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tozofelaterixijilapubo.pdfIn PDF document text
    • https://lawtutors.co.uk/js/ckfinder/userfiles/files/16624220734.pdfIn PDF document text
    • https://sensiblemachines.com/ckfinder/core/connector/php/files/44411103340.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=ben+10+heroes+mod+apk+unlimited+moneyPDF 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_off0000c99b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC99B 11188 bytes
SHA-256: 1a626f1ae65615cdb6e5d5b9520dbebc661b00f9fda791422a47a63ad9c943d2
font_01_sfnt_off0000e3a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A9 18476 bytes
SHA-256: 84d415c8bce8bac6236a6212b147491ba4e200ece436bfa36452530ed406c710
font_02_sfnt_off00011438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11438 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1