Malicious PDF — malware analysis report

Static analysis result for SHA-256 59b172d720c8fce1…

MALICIOUS

PDF

73.1 KB Created: 2021-09-24 03:15:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 578f9b1e98a48fb6b9dc3775b4a2ff55 SHA-1: c769017b45d774b8ecd4222ccf56033fc1017852 SHA-256: 59b172d720c8fce1e1ceb1457b763c83c8799712a66178a3a33c1b2fa24718a7
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The PDF contains numerous embedded URLs, many of which point to disposable hosting and are structured as a link farm, a common tactic for phishing or malware distribution. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://elitacasa.it/images/file/11565165080.pdf In PDF document text
    • https://yuanfuconstruction.com/ckfinder/upload/files/sobozasajesuwuderejonu.pdfIn PDF document text
    • https://lacgl.org/upload/editor/file/69321873228.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614248a196b15---55013140821.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/31467705380.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/754827994.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcc32b8db4---90367208511.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210911_9B971BC8A07ADA3E.pdfIn PDF document text
    • http://gzmingjun.com/uploadfile/files/20210910_052457.pdfIn PDF document text
    • http://www.predia.cz/userfiles/file/56788316875.pdfIn PDF document text
    • https://bursaphotofest.org/uploads/files/49389821946.pdfIn PDF document text
    • http://zzps.pl/userfiles/file/78414499309.pdfIn PDF document text
    • https://koratspring.com/upload/file/36098476564.pdfIn PDF document text
    • http://kastely-vacduka.hu/fileok/file/febopat.pdfIn PDF document text
    • http://vilniausgreziniai.lt/userfiles/file/sesenirefinexop.pdfIn PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/94539426840.pdfIn PDF document text
    • http://konsultacjenaukowe.eu/Upload/file/47269478601.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/mokexokusuwubazel.pdfIn PDF document text
    • http://olimpic.hu/ckfinder/userfiles/files/79724374374.pdfIn PDF document text
    • http://halmar.info/userfiles/file/16163716682.pdfIn PDF document text
    • https://hobbypet.cz/files/file/27873407058.pdfIn PDF document text
    • http://qzgj.cn/upload/file/xupirarugogusubofum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=rich+dad+poor+dad+pdf+kannadaPDF 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_off0000b859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB859 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d06b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD06B 18152 bytes
SHA-256: 0c456c7a20a5a4d0fcf8c2285c166bca6eafc88bf9d8804a71c354b9e219ba5e
font_02_sfnt_off0000ffb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB7 10412 bytes
SHA-256: d25b3ab503f9fa5567e99f84674339890316f78f70a3f3a961c3b09ce2368a32

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