Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1a3eff2980575aa…

MALICIOUS

PDF

77.7 KB Created: 2021-09-15 14:06:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6ef1f23f7a3ddf9c9fa16df5cb359ae7 SHA-1: c47bfd16bd2cce8a7b2eb31c2aeb3ae686d11429 SHA-256: c1a3eff2980575aa64e4a73e734df18e0f1524e7582b965afa79fda8e146495e
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, indicating a malicious intent to redirect the user. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the high ML score strongly suggest this is a phishing or malware distribution attempt. The embedded JavaScript is likely used to facilitate the download or execution of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://masini-de-ambalat.ro/images/userfiles/82149918812.pdf In PDF document text
    • https://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/lokoramiz.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/68138709902.pdfIn PDF document text
    • http://thaide.org/userfiles/file/gepibivagegepixor.pdfIn PDF document text
    • http://1-cities.com/blog_images/blog_/file/75565529901.pdfIn PDF document text
    • http://xn----ftbkdcamitb5h.xn--p1acf/files/fck/file/40801709310.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/46676612181.pdfIn PDF document text
    • http://blueleaves.ru/userfiles/file/gobudonufizomatakoz.pdfIn PDF document text
    • http://gyarmatilovastorna.hu/userfiles/file/19953834231.pdfIn PDF document text
    • http://mtegl.wsystem.sk/userfiles/files/fofikuwudonupufevitixi.pdfIn PDF document text
    • https://ms01bet.com/contents/files/61424275713.pdfIn PDF document text
    • http://movesearchesuk.com/userfiles/file/kiwadefudotuxaxotokamobo.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/90f8a1b9230c42fea216c5a091a8748c/latavodogumopa.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/1543389146.pdfIn PDF document text
    • https://yaofangpeixun.com/upload/files/kamapurajixefika.pdfIn PDF document text
    • http://wasserentkalkung.at/ckfinder/userfiles/files/narupugulisiv.pdfIn PDF document text
    • https://psychotherapie-coeppicus.ch/upload/file/julasajamowukewe.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/32936148257.pdfIn PDF document text
    • https://www.tahitotfaluovodak.hu/ckfinder/userfiles/files/91249179592.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16130c30370341---17483434957.pdfIn PDF document text
    • https://www.puskinas.lt/ckfinder/userfiles/files/senegolurabosapabeje.pdfIn PDF document text
    • http://konikanarrowfab.com/ckfinder/userfiles/files/dizogaxeribebuxematel.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/senut.pdfIn PDF document text
    • https://emailing-online.fr/uploads/userfiles/file/xetozanu.pdfIn PDF document text
    • http://stellarvvv.ru/ckfinder/userfiles/files/76783761872.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/37430479574.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=windows+7+installation+iso+imagePDF 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_off0000cbe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE9 10620 bytes
SHA-256: fb1f607882b3dd57a02aed1435a0d8fcd951a2026223b65e0b219ec48ef5b750
font_01_sfnt_off0000e411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE411 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC23 17304 bytes
SHA-256: b68b621fe051df61aa760aed29207bcf8133057a3c55a2343c2a24af0155fa50