Malicious PDF — malware analysis report

Static analysis result for SHA-256 4352d3d98252af0c…

MALICIOUS

PDF

100.8 KB Created: 2021-02-19 13:57:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f6de4c8892a8e5de80775aee83757bc9 SHA-1: 345cf0b664ea7e917c5de6878c16945276c0bf14 SHA-256: 4352d3d98252af0c032d91f453d2f33897cdd133b1aba3603dadc20b30ab176f
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically related to phishing. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. The presence of external URIs and the PDF_SEO_LINK_FARM heuristic indicate an attempt to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://baarspo.ru/aws?utm_term=price+of+admission+book PDF link annotation
    • https://cdn.sqhk.co/xeduwukaxusa/HhijhjD/dezetifujaveber.pdfIn PDF document text
    • https://cdn.sqhk.co/kawiwitifa/hcyogjR/31603757361.pdfIn PDF document text
    • http://lnstagramsupportinfo.com/antrag_baukindergeld_brandenburgepe70.pdfIn PDF document text
    • https://cdn.sqhk.co/xawodoze/fT0Ypig/80036122838.pdfIn PDF document text
    • http://lyudi23.ru/ernhrungsplan_anabole_ditjg8ka.pdfIn PDF document text
    • https://cdn.sqhk.co/wodaximewule/Biagdgg/video_maker_free_software_for_windows_10.pdfIn PDF document text
    • https://cdn.sqhk.co/zetikitor/higiTP3/75695804485.pdfIn PDF document text
    • https://wijodemarivupi.weebly.com/uploads/1/3/4/8/134861972/8e5fd9.pdfIn PDF document text
    • https://cdn.sqhk.co/zofukumane/khdij4P/petunifuvipofa.pdfIn PDF document text
    • https://cdn.sqhk.co/jupozaregu/h5jjFbv/word_search_puzzle_apk_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/kopilixa/7giGjjc/75005068047.pdfIn PDF document text
    • http://lenudes.com/general_anaesthetic_agentsssy65.pdfIn PDF document text
    • http://sebekeruxa.iblogger.org/tewuzodolejib.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bizamesuwepe/voxizixabifoj.pdfIn PDF document text
    • https://s3.amazonaws.com/nelizenejakarug/nimiro.pdfIn PDF document text
    • https://s3.amazonaws.com/wesezuzuvalirik/poremaweji.pdfIn PDF document text
    • http://xofunuxemijowex.rf.gd/xomidazufazuf.pdfIn PDF document text
    • 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://scripts.sil.org/OFLIn 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_off000135e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135E6 5340 bytes
SHA-256: baf95b2a039b78bf78defbdaa36165da96e9538dba616097d5a393f245236547
font_01_sfnt_off00014800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14800 12476 bytes
SHA-256: 0d1f12edc3c4c894b8acc3047a227ea712d9d7a663f30ded912d67af43a4cd65
font_02_sfnt_off00017150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17150 16104 bytes
SHA-256: 4d53b2dedbb9423e293889f4c2e4792b25f517b29841190b7463a8018858c3c3

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