Malicious PDF — malware analysis report

Static analysis result for SHA-256 045e5b9fcfb8e4af…

MALICIOUS

PDF

82.7 KB Created: 2021-09-21 06:07:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bdaa2cae2b4b34c1e32cd3776be47672 SHA-1: 4bb2a182ff1508bce6ded3a0a120c38583789ed1 SHA-256: 045e5b9fcfb8e4af59fa818292b054f1993d1ec09caea6a0f34cc184da960b0e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The presence of numerous external URIs, many pointing to disposable domains and configured as a link farm, strongly suggests a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and URI patterns are consistent with attempts to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://thanaclusterwestgate.leaddeehub.com/userfiles/files/riruzeduzorujekerasevusij.pdf In PDF document text
    • https://vsetinrally.cz/userfiles/file/14858782745.pdfIn PDF document text
    • https://zilalcooling.com/other_files/File/wibiniboxulu.pdfIn PDF document text
    • http://villkasz.hu/editor_up/91255296298.pdfIn PDF document text
    • https://www.rougeindigo.com/ckfinder/userfiles/files/61027650960.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/nugukuf.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/15000906375.pdfIn PDF document text
    • http://tnmetalworks.com/images/files/xofavej.pdfIn PDF document text
    • https://kanat.com/upload/ckfinder/files/33884552307.pdfIn PDF document text
    • http://xmzs.org/userfiles/file/voluwo.pdfIn PDF document text
    • http://luxmeterthai.com/ckfinder/userfiles/files/16221558300.pdfIn PDF document text
    • https://kluchar.net/klucharnet/images/file/10046572848.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/24812528005.pdfIn PDF document text
    • https://www.borzabadi.com/ckfinder/userfiles/files/dobegiverapukapavip.pdfIn PDF document text
    • http://pointerboards.com/uploads/admin/files/fubeneg.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613c792a5ff37---22353816419.pdfIn PDF document text
    • http://pibar.tw/uploads/files/202109081656159839.pdfIn PDF document text
    • http://theurbanbazzaar.com/userfiles/file/wemamolud.pdfIn PDF document text
    • http://sinosteelcode.com/filespath/files/20210917062053.pdfIn PDF document text
    • http://sunpix.ru/img/lib/file/23212072697.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/95046304504.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/44163075025.pdfIn PDF document text
    • http://wakesup.org/userfiles/file/xuresekepozavotugomeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=skyrim+loud+and+clear+sewerPDF 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_off0000dbd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD7 18104 bytes
SHA-256: 562e0342056dc308dff99496ee689c62a98a0c8752093d06fa4330fd322e04c7
font_01_sfnt_off00010a8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8A 10900 bytes
SHA-256: 0ced2fbca005b3afd2ad827b2387c32f866d783951f6b8c462db126e114ee400
font_02_sfnt_off000123c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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