Malicious PDF — malware analysis report

Static analysis result for SHA-256 098c92a514fc6481…

MALICIOUS

PDF

90.1 KB Created: 2021-09-09 14:14:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a6275bc4cec1edf478b9a7507e631365 SHA-1: 35c1c1e9ee3384093c5b414a1748ae05db96744b SHA-256: 098c92a514fc6481c67c7a4765c05a613e2ddd434a00d0f4b2c725a31302f487
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The presence of embedded JavaScript indicates an attempt to execute code, likely to redirect the user to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 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://archism.ru/uplcv?utm_term=cheats+the+sims+mobile+android PDF link annotation
    • https://littleitalypizzany.com/nbloom/fckuploads/file/35732246727.pdfIn PDF document text
    • http://statsale.com/data/upload/ck/files/gepidewabefibujixonufope.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/radabo.pdfIn PDF document text
    • http://nhadatv.com/webroot/img/files/36148320542.pdfIn PDF document text
    • https://cokhivietuc.com/img-vietuc/files/27916187577.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/xemejopixidu.pdfIn PDF document text
    • https://iuoshili.com/upload/users/files/modulexawogavagevon.pdfIn PDF document text
    • http://www.cbs-emballages.com/upload/file/dadilajibel.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/nememuxozisezepunevoxu.pdfIn PDF document text
    • http://www.mattig-accounting.bg/fisiere/file/gurukilonejopezolesom.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/40394776517.pdfIn PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/6930937851.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/14420498034.pdfIn PDF document text
    • http://wmsone.com/eimages/file/raniwirutavobewuxekap.pdfIn PDF document text
    • http://badgerhillfarm.uk/46681794360.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/91799048707.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/bebunavumajug.pdfIn PDF document text
    • http://www.keizerco.nl/userFiles/file/pusefara.pdfIn PDF document text
    • https://huaku3c.tw/uploads/files/202109022033251952.pdfIn PDF document text
    • https://coffeetuanvang.com/Images_upload/files/duxowubatowaxunupevegobu.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/89774561538.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/518b6a8409358a763f47d9fcbde23905/51153550094.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/24401885334.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://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_off0000fd68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD68 17536 bytes
SHA-256: 1d7a835447eafe631155db4b292cadec698128c3fd363aab23f03773677b9a12
font_01_sfnt_off00012a7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14296 10684 bytes
SHA-256: a023c4977405e127486997f531032e670a79dbe0f09f301a1127fe2df9ef69cc

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