Malicious PDF — malware analysis report

Static analysis result for SHA-256 4435d1e5e54d0aaa…

MALICIOUS

PDF

71.3 KB Created: 2021-09-20 11:07:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 59ad191f0750c8d9cbcf3bc54f17ecfe SHA-1: 4b27d6797366e397e4b0573c15689eff6c97e573 SHA-256: 4435d1e5e54d0aaad7b7578935d69c904fc240ece1046e625ef5454e5a9c5a2a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to distinct domains, indicating a link farm. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic confirms this, suggesting an attempt to obscure the final destination or distribute malicious content. ClamAV detection and ML classification further support its malicious nature, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://szintai.hu/ckfinder/userfiles/files/53820267951.pdf In PDF document text
    • https://iqrainternationalschool.org/_assets/files/rurufib.pdfIn PDF document text
    • https://defi128.com/userfiles/files/goxoxaguzeruturunelom.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/kuliwexobiruzewonufakid.pdfIn PDF document text
    • http://skalamatbaa.com/userfiles/file/ximamusewam.pdfIn PDF document text
    • http://yujinpharma.com/upload/files/tamavebub.pdfIn PDF document text
    • http://vuoncotichdep.com/upload/files/55220142694.pdfIn PDF document text
    • https://kaptenhoki.net/contents/files/78969005776.pdfIn PDF document text
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/jobizefisi.pdfIn PDF document text
    • https://www.stock2morrow.com/ckfinder/userfiles/files/43948571897.pdfIn PDF document text
    • https://tjp2-hotlink-j3t.com/contents/files/54540579249.pdfIn PDF document text
    • http://apple888.vn/luutru/files/relasipelijap.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/89866395908.pdfIn PDF document text
    • https://network-italia.com/file/50903879131.pdfIn PDF document text
    • http://polins.org/public/userfiles/file/51490007566.pdfIn PDF document text
    • http://vector-food.pl/userfiles/file/93991678723.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/berituzo.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613f98c7a980d---bafutafu.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/jemebagoxiwulu.pdfIn PDF document text
    • https://mycultureis.com/FileData/ckfinder/files/20210915_F42974BB25274A64.pdfIn PDF document text
    • http://www.neoneofitou.com/ckfinder/userfiles/files/70965736390.pdfIn PDF document text
    • http://ngocphuocjsc.com/public/default/ckeditor/files/wukupawibasalusazejaji.pdfIn PDF document text
    • http://uteambio.com/upload/files/23607478417.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/xizunazewamusaku.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/46257231698.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=teams+on+androidPDF link annotation
    • http://abcs.umontreal.ca/upload/files/40474345061.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_off0000b5a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5A8 10228 bytes
SHA-256: 6fa808f5c9b5515b5c4db0b141ab5575f5d6dc6e072e3cf031655a9bcdb59159
font_01_sfnt_off0000cc8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e49f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49F 16900 bytes
SHA-256: 9163663b940e26dac5a9766c6a76e547e2e41e8af04c9740d191f53340819732

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