Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4e1a46134f16dc0…

MALICIOUS

PDF

70.2 KB Created: 2021-09-29 00:07:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 58b89a36275a637236ef64c441da497f SHA-1: d6ac42b6cfee6e1c2a8c14783d7f7b8034cfb9b2 SHA-256: b4e1a46134f16dc07a27f75ea1d8327ca86cbdba9daa6012d231e4eb691d9f1e
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document contains numerous embedded URLs pointing to various PDF files hosted on different domains, indicating a link farm or distribution network. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is not a legitimate document but rather part of a scheme to manipulate search engine results or distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb97940daf---sasejazalazuniguki.pdf In PDF document text
    • https://akapacha.com/userfiles/file/ruxotuv.pdfIn PDF document text
    • http://kientrucsangtrong.com/plus/files/dijalutoforeta.pdfIn PDF document text
    • http://twgo8.com/uploads/base/files/202109031348407709.pdfIn PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/xatugupejed.pdfIn PDF document text
    • https://cliniquemyo.com/userfiles/file/39577656810.pdfIn PDF document text
    • http://rockycheng.com/ckfinder/userfiles/files/sigagebeturaxeburetodin.pdfIn PDF document text
    • http://briquettemachinery.com/d/files/33590970205.pdfIn PDF document text
    • http://artediapharma.com/upload/files/venonakixela.pdfIn PDF document text
    • https://jensbrode.de/files/file/kugefazib.pdfIn PDF document text
    • https://otterdisplay.com/userfiles/file/17434993589.pdfIn PDF document text
    • http://slesnick.net/userfiles/files/12299939933.pdfIn PDF document text
    • http://vigova.vn/Images_upload/files/regupalo.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/vasajonog.pdfIn PDF document text
    • http://ziconiavip.com/uploadfck/file/zuxazifawadimafixuzoxu.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/90801813563.pdfIn PDF document text
    • http://pieseclimaauto.com/files/file/6730456164.pdfIn PDF document text
    • https://www.moxiclear.com.au/application/third_party/ckfinder/userfiles/files/74040726399.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/rosesunuzaxekopus.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/23982906128.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021090402115973499.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/16077608393.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=dragon+ball+z+budokai+tenkaichi+5PDF 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_off0000aebb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEBB 11008 bytes
SHA-256: 9d0a9c0238c16b2633dea07fe34c1673207a300593eb6c2d38d1f99c0487eed8
font_01_sfnt_off0000c812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC812 17160 bytes
SHA-256: ffe083025b2841a12cdb448b8baf386e1f9567e2e0b1a508c6edf8512569f18a
font_02_sfnt_off0000f38e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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