Malicious PDF — malware analysis report

Static analysis result for SHA-256 511733de69c0dc56…

MALICIOUS

PDF

70.6 KB Created: 2021-09-18 02:53:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2087503ebc95ca452e3515f8cb73b518 SHA-1: 66f93c91a05415baabbd5a899ae301437d6eb9a9 SHA-256: 511733de69c0dc5683695be612037c082fe5fb4edad0937d1fc689e012579193
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, indicating a potential phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious sites, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://dioblina.eu/userfiles/file/74758287164.pdf In PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/vegirufizedunu.pdfIn PDF document text
    • http://chpcentre.com/files/file/xifaxonipulidapazapiwezet.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/felebobuma.pdfIn PDF document text
    • http://safetruck.gr/images/file/kukatiwesukoko.pdfIn PDF document text
    • http://rfinshaat.az/userfiles/file/69385716751.pdfIn PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/wakoxavo.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/suponu.pdfIn PDF document text
    • http://ibookingkr.com/FileData/ckfinder/files/20210910_23D71523DC1B2558.pdfIn PDF document text
    • http://ciccioinpentola.com/userfiles/files/73173833170.pdfIn PDF document text
    • http://muabannhagiare.net/images/uploads/files/wuxiwirixaloduvaluma.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8a4e4a3df---92709086651.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/55656710935.pdfIn PDF document text
    • http://landpas.pl/upload/file/tifuvevokiwadupojevejiz.pdfIn PDF document text
    • http://lawngo.net/fckfiles/xiwigilul.pdfIn PDF document text
    • http://urs-certification.com/gais/image/file/58381754972.pdfIn PDF document text
    • https://norservis.com/files/files/powuzepuxa.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/161443c66aab15---41107961704.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/11902124981.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/visawaze.pdfIn PDF document text
    • https://ciiinnovationsummit.com/ci/userfiles/files/88463644237.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=tale+of+the+nine+tailed+ep+2+eng+subPDF 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_off0000af98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF98 11000 bytes
SHA-256: d4a04887636d247653bfc644720b5a9be67a0dba098b1a6626fe785dfabd91ea
font_01_sfnt_off0000c8ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e0cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CC 16872 bytes
SHA-256: 8207505e6212cb1893aa2258332879e3799903ef8d5417ea7911168744315114

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