Malicious PDF — malware analysis report

Static analysis result for SHA-256 959a71968d138c41…

MALICIOUS

PDF

84.1 KB Created: 2021-09-20 15:12:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 0d4158768ba661c8e54f3e07d1fab811 SHA-1: 17343dccce39606ed717c3801e567ef7d1f0d58a SHA-256: 959a71968d138c4185ce8396637b8258584ad19d8a766d353a4cacddfcfa0df6
126 Risk Score

Malware Insights

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

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://cybernet.asia/UserFiles/File/dolodukane.pdf In PDF document text
    • https://theshamrockpublecco.it/file/16191853524.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/birakigavusuzowopufigave.pdfIn PDF document text
    • https://www.seblocation.com/ckfinder/userfiles/files/zoruzumos.pdfIn PDF document text
    • http://888chji.com/userfiles/files/36935503838.pdfIn PDF document text
    • http://we-women.de/default/files/uploads/file/3412386480.pdfIn PDF document text
    • http://smeeing.com/userfiles/files/14776809327.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/248902b5c749a5aa5bfdbedcd8783316/53066161701.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/vofijobaf.pdfIn PDF document text
    • http://rayocazar.com/images/elfinder-1.1/files/file/46689705731.pdfIn PDF document text
    • https://www.highlandernepal.com/assets/ckfinder/userfiles/files/97548385840.pdfIn PDF document text
    • http://ecompletecontact.com/ckfinder/userfiles/files/gixakegapupuzufab.pdfIn PDF document text
    • http://gaushalango.com/uploaded_files/userfiles/files/wumizalopu.pdfIn PDF document text
    • http://humidorio.de/ckfinder/userfiles/files/tugizisubex.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/9953403012.pdfIn PDF document text
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/6204351176.pdfIn PDF document text
    • https://simpangkanan.com/contents/files/xibegenixolomitufejotobur.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147b6f573529---18946135222.pdfIn PDF document text
    • https://tablouri.emilianchirila.ro/imagini/files/35689229057.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/lezirenisuniboman.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/15536511696.pdfIn PDF document text
    • https://chulintemple.house-well.com/CKEdit/upload/files/juwepozexogoxav.pdfIn PDF document text
    • http://miass.realxenon.ru/uploads/files/goxibezunol.pdfIn PDF document text
    • http://manpukuorder.com/uploads/files/zetozat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=rpg+para+android+offlinePDF 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_off0000e428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE428 10452 bytes
SHA-256: 89a541ca16d175e7673c39ed1d3787cbc87a349d2aaeba6e583c4dec5528917e
font_01_sfnt_off0000fbb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB3 18536 bytes
SHA-256: 2d2e0484035f8517d044f0ff33408e89ead292d1ac94e959f532aabb7f8466db
font_02_sfnt_off00012ab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1