Malicious PDF — malware analysis report

Static analysis result for SHA-256 b82aa2a7f8652efa…

MALICIOUS

PDF

72.3 KB Created: 2021-09-13 00:50:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d445ff5596714ac4984b4195f1b2c3c7 SHA-1: 60dd502d8026ca3f51ee3d5707271f2d8c1f6201 SHA-256: b82aa2a7f8652efa637c431e45c23a42387c87981db96a73a725d7f0e313c5b0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or trojan distribution. It functions as a link farm, containing numerous embedded URLs that point to other PDF files hosted on various domains, suggesting a multi-stage attack or a method to obscure the ultimate malicious destination. The presence of many distinct hosts and links per host indicates a deliberate effort to spread malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://laserinnsbruck.com/static/rivaludutaveb.pdf
    • http://geyuping.com/geyuping/uploadfile/file/2021091000211073499.pdf
    • http://villabrown.it/userfiles/files/19183257867.pdf
    • http://indagosrl.it/userfiles/files/luvizipalasibuwonuwamixi.pdf
    • http://tcyy88.com/userfiles/file/2021090808053173499.pdf
    • https://atrax.eu/userfiles/file/97793461837.pdf
    • http://salman-group.com/userfiles/file/jabokuxasifomaluvebarona.pdf
    • https://zlatartopalovic.rs/files/sajajizivovufitenaxe.pdf
    • https://menokatea.in/ckfinder/userfiles/files/wafesaro.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c27928fef9---25443154384.pdf
    • http://thaoduocvn.com/userfiles/image/file/87509050655.pdf
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/27020408255.pdf
    • http://workcoop.org/fckeditor/userimages/file/20210908042819.pdf
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/ramowepivukapapanep.pdf
    • https://thucphamtruongxanh.com/Upload/files/boledivusoreza.pdf
    • https://hyundainhapkhau.vn/upload/files/89152492176.pdf
    • http://citra.cl/userfiles/file/44097092860.pdf
    • https://www.geya99.com/ckfinder/userfiles/files/60765990159.pdf
    • http://oio.cn/uploadfiles/files/16408581534.pdf
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/10c74d4a5791de76d5bc23c1408146f1/44404663105.pdf
    • https://mirrorlink.com/public/files/files/14817340290.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=first+conditional+exercises+worksheet
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b7ea.bin
c17e340fb0ec78d942fee5c5e5cbf35de0d793212f393ea074479cd47162c400		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB7EA 10724 bytes
font_01_sfnt_off0000d088.bin
389aba78d591158a27da80a6011327abfb35d7c14521e57d7a9eedc3b13f71a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD088 16872 bytes
font_02_sfnt_off0000fbce.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCE 16792 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.