Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c3093555f9f8eae…

MALICIOUS

PDF

92.0 KB Created: 2021-09-23 00:59:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9bcf897b87546e2681a6e86170ce649a SHA-1: 4cb848462448c80d06acf9672483074ba6a1bff2 SHA-256: 1c3093555f9f8eae32d4e326c09461b0b4293cfc664afea35a69c520f1f0e5ee
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains embedded JavaScript and numerous external URIs, many of which point to disposable domains, indicating a link farm likely used for phishing or malware delivery. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://driftwoodcc.com/userfiles/files/2780096562.pdf In PDF document text
    • http://konemara.hu/userfiles/file/3107743081.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/48500142117.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/161324567bb58a---kokaw.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/27032418216.pdfIn PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/sivel.pdfIn PDF document text
    • http://familiehollander.nl/images/uploadedimages/file/89961441730.pdfIn PDF document text
    • https://indiansabroad.uk/userfiles/file/sukoxisijon.pdfIn PDF document text
    • https://hearing-outlet.com/uploads/files/202109100643136172.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/4772772685.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/bomududobajoj.pdfIn PDF document text
    • http://cz-synergy.cz/data/file/ripijedaveviwig.pdfIn PDF document text
    • https://curtain.jinware.com/upload/files/55184702409.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/pamutajuzidudekajojufo.pdfIn PDF document text
    • http://studiodelcorso.eu/userfiles/files/bukosoputosakuruzalada.pdfIn PDF document text
    • https://southwestlooms.com/admin/userfiles/files/lizud.pdfIn PDF document text
    • https://lanjutpt1.com/contents/files/pudezaxejubusi.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/78017356960.pdfIn PDF document text
    • https://yk-tech.com.tw/ckfinder/uploads/ckfiles/files/16953591246.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/xasanikexuxaripivukugumom.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ba639b400f---10598260079.pdfIn PDF document text
    • https://millinerandassoc.com/files/file/61701069257.pdfIn PDF document text
    • http://scuderia512.com/js/upload/files/91677152968.pdfIn PDF document text
    • http://stroyindustry.com/userfiles/file/40619612644.pdfIn PDF document text
    • http://ride-on-earth.com/images/blog/file/47813917637.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/29006541980.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=android+open+softwarePDF 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_off000106c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C0 16892 bytes
SHA-256: 534c68482ac66bde7512abe512558834ec95ce7084e3c084b31d2dd7acbd18ac
font_01_sfnt_off0001326e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1326E 10512 bytes
SHA-256: 05155c889bcf98a1f58a084cc011394e49c1d2102a15c6b2da89f222848a5727
font_02_sfnt_off00014a93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1