Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaa9cd59e7d6aa2f…

MALICIOUS

PDF

94.5 KB Created: 2021-09-18 13:20:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ab7d5b196f8247900aa8c026953e23e0 SHA-1: 0713d6b83eb9458e49405825b6e8f9fdc4e34763 SHA-256: eaa9cd59e7d6aa2fd3442eecce2cd5302ac234facde1c43c420c2f917949d7dc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to potentially compromised or malicious domains, suggesting a link farm or redirection mechanism. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to direct users to external content, aligning with phishing or malware distribution tactics.

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://chuanghuilaw.com/filespath/files/20210909175657.pdf In PDF document text
    • https://www.pharmawell.eu/ckfinder/userfiles/files/63844474459.pdfIn PDF document text
    • http://planao.com/ckfinder/userfiles/files/rafidawa.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/3815135a8de54d94a83258e8d1ac6b9d/10454942011.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/nekawakesajeminagilotalob.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/jipifivusibupam.pdfIn PDF document text
    • https://itandem.net/ckfinder/userfiles/files/45671039764.pdfIn PDF document text
    • http://architettomontanino.eu/userfiles/files/kezatukafolowazuj.pdfIn PDF document text
    • https://nirkongrp.com/ckfinder/userfiles/files/farakimeme.pdfIn PDF document text
    • http://sure2trips.com/bot/ckfinder/uf/files/58517011944.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210901_A9495E4F045EBC73.pdfIn PDF document text
    • http://goldenagegroup.vip/userfiles/file/mizepubas.pdfIn PDF document text
    • http://studiofranzoni.eu/userfiles/files/xuzubiwokexorexisive.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/89defa77b01c4648417552cb28bd4452/fiwebisapozukema.pdfIn PDF document text
    • http://xhiehchin.com/Xhieh_News/_file/xowexifopidil.pdfIn PDF document text
    • http://apothepharma.com/upload/files/fabanevodajepefoxolumu.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/70735560636.pdfIn PDF document text
    • http://print-printonline.com/ckfinder/userfiles/files/pomoti.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/81844310157.pdfIn PDF document text
    • http://www.og2c.com/images/file/98969810158.pdfIn PDF document text
    • https://austarpharma.austarchina.com/upload/files/nirin.pdfIn PDF document text
    • https://olboihorgaszto.hu/editor_up2/jemiwedujij.pdfIn PDF document text
    • http://energcomb.net/cms_enercomb/sgi_userfiles/userfiles/files/75767616906.pdfIn PDF document text
    • http://flapboxes.custompackageboxes.com/userfiles/files/tewatobikive.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=american+ninja+warrior+123moviesPDF 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_off00010a40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A40 18572 bytes
SHA-256: 22c4cf13a77376edeff9295ffa4b524544e6d16d57e2b3b2bb9abd0272f79971
font_01_sfnt_off00013b10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B10 10856 bytes
SHA-256: c63a70b6fcf4e8fd76e0cd2068716ab426aa4213e2d340a31f81e057b0b76669
font_02_sfnt_off0001543e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1543E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1