Malicious PDF — malware analysis report

Static analysis result for SHA-256 098250a621fa3186…

MALICIOUS

PDF

67.3 KB Created: 2021-10-02 22:00:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b0aa0beb3bc32e06f9a4951a3fe31e52 SHA-1: eae19ba508e08e58a65315eac6ccc5348824818e SHA-256: 098250a621fa31869a3e5844bcf0e41eaedf41858c063f022104d284e7436486
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to various domains. The document body is heavily obfuscated, preventing a clear understanding of its direct content, but the overall structure and URL analysis strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://daearesort.com/FileData/ckfinder/files/20210916_86184369F6E5CD84.pdf In PDF document text
    • http://vipacademy.org/userfiles/file/48421471439.pdfIn PDF document text
    • https://client-sms.com/ckfinder/userfiles/files/20228173733.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/85531405417.pdfIn PDF document text
    • https://vrrc.heart.net.tw/ckfinder/ckfiles/files/zivil.pdfIn PDF document text
    • http://vincentianssjp.com/userfiles/file/9337730805.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/de3d091e01daae6c530b9dd3ad41f91f/wujixetow.pdfIn PDF document text
    • http://eichler-kammerer.de/84297954231.pdfIn PDF document text
    • http://zhjpharm.com/upload/files/94260881906.pdfIn PDF document text
    • https://matfreklam.com/calisma2/files/uploads/sazoxedesape.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/69052797942.pdfIn PDF document text
    • https://globalybm.com/ckfinder/userfiles/files/1630704821.pdfIn PDF document text
    • http://centonze-vini.com/userfiles/files/83725159126.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/bipivarizati.pdfIn PDF document text
    • http://gavionescodeinsa.com/userfiles/96561196101.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/lutog.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/divazalaziji.pdfIn PDF document text
    • https://exam11.menapoint.com/app/webroot/upload/files/33239082133.pdfIn PDF document text
    • http://knipia.com/userfiles/file/javurijanasak.pdfIn PDF document text
    • http://disonde.com/filespath/files/20210917132317.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210926_160750.pdfIn PDF document text
    • http://directartdeal.com/uploaded_files/userfiles/files/32015018902.pdfIn PDF document text
    • https://dnm.tw/uploads/files/202109221017222534.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=pinworms+from+dirtPDF 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_off0000ad37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD37 10260 bytes
SHA-256: 56ff239732a02712f0efa6b15cade26a9da1c634d92021ef7fe685088d887328
font_01_sfnt_off0000c449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC449 14532 bytes
SHA-256: a5d8b9c21e06578bfad21a7ba2ff1d49a02e115a8a7a2cc58229e9a5699f822d
font_02_sfnt_off0000e823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE823 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1