Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2c197f973c21fa0…

MALICIOUS

PDF

106.2 KB Created: 2021-10-05 23:04:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: bea5b95e935fad7ba644195467d17893 SHA-1: f0bb49dffc7ffe623798e024842ace169e47676b SHA-256: c2c197f973c21fa0eb97366fa74b0ab5bb3a811837b2eef6e019f8ef603fd58f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a large number of embedded URLs, many of which point to other PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically identifies this pattern as a tactic to distribute malicious content. While no scripts were explicitly extracted, the nature of the embedded links and the overall structure strongly suggest an attempt to lead the user to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://ambient-interier.cz/files/files/fajirajokapijuviwija.pdf In PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0ccf244c3---zavawerir.pdfIn PDF document text
    • https://rockeit.com/userfiles/file/linok.pdfIn PDF document text
    • http://760_709737661.mildmedia-dev.eu/uploads/userfiles/files/70736148984.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20211004113603.pdfIn PDF document text
    • http://anael.fr/fckeditor/userfiles/file/25076737850.pdfIn PDF document text
    • http://maychaybocaocap.com/app/webroot/uploads/files/sosepimez.pdfIn PDF document text
    • https://wroclaw-effatha.pl/grafiki/file/kodivomalifamopilev.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/ketapi.pdfIn PDF document text
    • http://dvg.asia/ckfinder/uploadfiles/files/jexapafifaxegesu.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/jitufatube.pdfIn PDF document text
    • http://ktcz.eu/files/files/64793185265.pdfIn PDF document text
    • http://matraholding.hu/images/userfiles/files/xipuviluluxam.pdfIn PDF document text
    • https://khonggiansangtao.com/platformecom/img/upload/file/bixak.pdfIn PDF document text
    • http://jiachuankeji.com/upload_fck/file/2021-10-4/20211004084504282218.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/76503684156.pdfIn PDF document text
    • http://remobudostol.pl/pliki/3109950867.pdfIn PDF document text
    • http://ventensis.lt/public/ckfinder/userfiles/files/mozolosuwuwomufevoda.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/files/bokekelikizoxupenixojuf.pdfIn PDF document text
    • http://shop-exclusive.cz/userfiles/file/melonaxofososapifu.pdfIn PDF document text
    • http://zjnep.com/ckeditor/ckfinder/userfiles/files/9211480269.pdfIn PDF document text
    • http://faptvmedia.com/userfiles/file/22645928934.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/vaxunewavoruxunit.pdfIn PDF document text
    • http://3dtechgroup.com/uploads/image/files/8227212527.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/268632832.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=beethoven+symphony+no+5+in+c+minor+analysisPDF 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_off00012fa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000147b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147B7 11004 bytes
SHA-256: a26cc0cb0487ef19f1abdde3a3f3f9d70943f80eaecb23d95877ea9c6ebf0367
font_02_sfnt_off00016137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16137 22260 bytes
SHA-256: eebe6d755c0166aa7b4e320779642b742332ed13b71a1be235c6715229fab6df