Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c2889585521a8e8…

MALICIOUS

PDF

83.9 KB Created: 2021-09-15 17:10:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3022646fa5c1ba03751062ded28eaf11 SHA-1: 2f861491a2588545a7dcd19a912b66ec3321b786 SHA-256: 2c2889585521a8e8b9093cc4050895037b8142269fa31ebd649e751f72513e41
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs pointing to various domains, many of which are likely part of a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically identifies this pattern, suggesting the document's primary purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://sapientgenerator.ru/files/userfiles/files/basopebefinojorerozow.pdf In PDF document text
    • http://lepal.sk/ckfinder/userfiles/files/86790921862.pdfIn PDF document text
    • http://dsagco.com/Upload/file/kovazetaxem.pdfIn PDF document text
    • http://888spirits.com/userfiles/file/mesitulobebusewimew.pdfIn PDF document text
    • http://tgroupsrl.com/userfiles/files/92490766998.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/17344610690.pdfIn PDF document text
    • http://susasoft.com/upload/userfiles/files/dajomaxukegogi.pdfIn PDF document text
    • http://sperrincaravans.com/images/file/jogujo.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210911021839.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613914bbd02ab---zojok.pdfIn PDF document text
    • http://wiskind.com/filespath/files/20210911022622.pdfIn PDF document text
    • http://marsalanoleggio.it/userfiles/files/jativivudo.pdfIn PDF document text
    • https://marbeyoyun.com/calisma2/files/uploads/binobomemezuzanusi.pdfIn PDF document text
    • https://resortweeks.pro/userfiles/file/40253085780.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/bexefumaxefesufogi.pdfIn PDF document text
    • https://rintrans.com/files/20318376159.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/60935997668.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16135e7a28d722---4796289359.pdfIn PDF document text
    • http://tipiland.net/upload/file/7823449635.pdfIn PDF document text
    • http://www.sudeshnamaulik.com/fckimages/file/jewevowatudujikedelolebu.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/48531815323.pdfIn PDF document text
    • http://eptesteplelek.com/uploads/file/12454537963.pdfIn PDF document text
    • https://ratco-hardware.com/Ups/files/newidasejurifuxor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=best+game+hacking+app+for+androidPDF 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_off0000df2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF743 11164 bytes
SHA-256: 6def89104ba0cbab15973f9464aa92560952ce5f369146072458edc8bbe88efa
font_02_sfnt_off00011100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11100 18836 bytes
SHA-256: 16cba8e719ed4ebc7fefec4e0b5e6bf24788529876a3d4727466267abee441d6

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