Malicious PDF — malware analysis report

Static analysis result for SHA-256 69fb5557962543ff…

MALICIOUS

PDF

78.0 KB Created: 2021-09-19 02:37:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ae46b516be4305dd08c663feb3cefdbc SHA-1: f2d8d67356e02a960c1e9d1086fd31a6e2e6d171 SHA-256: 69fb5557962543ff04cb106b7341136f0335f80ad1b0b20399681eae2fa7de5f
126 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It 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 a tool for SEO manipulation or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://usagimatur.com/files/others/73350813532.pdf In PDF document text
    • http://giteduguedesboires.fr/userfiles/file/zimot.pdfIn PDF document text
    • http://bfttacg.marketsearching.com/upload/files/jovokasobujixepasefomega.pdfIn PDF document text
    • http://paneldeconsos.com/userfiles/file/wobapemuwoka.pdfIn PDF document text
    • https://airxps.com/userfiles/files/wefadiwedavaji.pdfIn PDF document text
    • https://asken.as/bilder/file/41153920436.pdfIn PDF document text
    • http://matrix-corporation.com/upfiles/editor/files/49951038949.pdfIn PDF document text
    • http://floramarble.com/uploads/kotejojirepidijopanar.pdfIn PDF document text
    • http://hfengly.dk/skoleportalen/userfiles/file/36410871224.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/44199577119.pdfIn PDF document text
    • http://topas.lt/userfiles/file/nidele.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/58265126084.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/12338737647.pdfIn PDF document text
    • https://tenekedjieva.com/uploads/file/67127517529.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/nozonet.pdfIn PDF document text
    • http://24x7taazasamachar.com/assets/ckfinder/core/connector/php/uploads/files/41119044545.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/76766801865.pdfIn PDF document text
    • http://ventss.ru/userfiles/files/72807172938.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/20212285497.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/5c169e0d199fcd903595f183daf20da8/fetep.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/21423576701.pdfIn PDF document text
    • http://fulns.com/uploadfile/fckedit/file/1631060153tYHy.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/21253828546.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=kobocollect+app+apk+downloadPDF 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://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_off0000d3ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC16 10456 bytes
SHA-256: d131979ec7a2b09c277e307b12d12f73b49aeaf69ffc92d71160b277da590686
font_02_sfnt_off000103c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C7 17084 bytes
SHA-256: 113f8820979e9b211b6946e694488e8328f1a8ec22752d5f99474d5ceb06beac

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