Malicious PDF — malware analysis report

Static analysis result for SHA-256 018ff473192937cc…

MALICIOUS

PDF

69.7 KB Created: 2021-09-24 01:01:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b13772a834c73c097510cefe8a49e103 SHA-1: da9719378c4ad17506967fca66f31783d01c8cfe SHA-256: 018ff473192937cc0ea2f046d9c0a3850272bd599d72ee0d8fc90e20dd54d523
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a large number of external URIs, many hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are characteristic of phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://allytemp.ru/uplcv?utm_term=turbo+car+racing+download PDF link annotation
    • https://llbyggodesign.se/UserFiles/files/gigixezeduputuravoxewug.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/50988014853.pdfIn PDF document text
    • http://antitumor.org/filespath/files/20210903004915.pdfIn PDF document text
    • http://interfacetravels.com/app/webroot/js/ckfinder/userfiles/files/28102890672.pdfIn PDF document text
    • http://www.pilatesyoga.hr/files/files/kovovemapebukedo.pdfIn PDF document text
    • http://solartgaleria.hu/images/file/kimomuma.pdfIn PDF document text
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/46558098025.pdfIn PDF document text
    • https://www.colegiodomus.com.br/js/ckfinder/userfiles/files/kusejajimijinomikotuve.pdfIn PDF document text
    • http://an-professional.ru/img/files/file/labonimavav.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/26152849364.pdfIn PDF document text
    • https://sabresources.com/FCKuploads/file/23199043299.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/12314153564.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/86782185575.pdfIn PDF document text
    • https://u-spot.biz/js/ckfinder/userfiles/files/73489696995.pdfIn PDF document text
    • https://wittnebel.dk/file/fonapas.pdfIn PDF document text
    • https://hijaustabilo.com/contents/files/joxawoxejo.pdfIn PDF document text
    • http://e-district.org/userfiles/file/vurezikitevuwoxakipukum.pdfIn PDF document text
    • http://ageofwonders.buka.ru/sadm_files/rixubowop.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/wojefuwalewemitipi.pdfIn PDF document text
    • https://laps.pl/userfiles/file/89230100906.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/kizonamedevaval.pdfIn PDF document text
    • https://sopkambing.com/contents/files/21760418250.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_off0000b17a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB17A 10436 bytes
SHA-256: 8f5d07b56cb61b0b96c16edb71a41cb6b341234bb8e9b5bb9dc3ea42a20e1373
font_01_sfnt_off0000c906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC906 15956 bytes
SHA-256: 090e30e2fec5dc30d3a787ad0dc8361681c9cfdf3491d1e0654fe1679649cd88
font_02_sfnt_off0000f1a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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