Malicious PDF — malware analysis report

Static analysis result for SHA-256 50bcc28f8c9a8df4…

MALICIOUS

PDF

72.5 KB Created: 2021-09-27 14:26:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b0a146320f786a54138f29c34758c77c SHA-1: 8d3d0225a6af5f98bb39fc0b718e63d6d576fd6d SHA-256: 50bcc28f8c9a8df4587908ca4b3cc064fddda18c1b61018ae70d49176243a7d6
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan delivery mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links pointing to distinct, potentially disposable hosts, suggesting a tactic to distribute malicious content or phish for credentials. While no scripts were explicitly extracted, the nature of the links and the PDF structure strongly suggest an intent to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://globalfeedindustry.com/upload/files/73392430171.pdf In PDF document text
    • https://gulamanis.com/contents/files/tigiwitet.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/66443088864.pdfIn PDF document text
    • http://talcmanagement.com/uploaded_files/userfiles/files/58503151641.pdfIn PDF document text
    • https://quangcaowebsite.xemlaco.com/uploads/files/93149814903.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/92669636980.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/74428139004.pdfIn PDF document text
    • http://altus.pl/userfiles/file/wazamagewidibagal.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/57446948382.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/tuvafejevufog.pdfIn PDF document text
    • http://www.medic-pneumolog.ro/fisiere/file/jojikujufaxorirowonuv.pdfIn PDF document text
    • https://www.creativetalentnetwork.com/ckfinder/userfiles/files/12105693307.pdfIn PDF document text
    • https://dveropolis.ru/upload_picture/wofebezifezadalazi.pdfIn PDF document text
    • http://xaydunglenguyen.vn/upload/files/ba638e.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/pasezawitawidugubetakip.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/7v7iqnol1onmn808ij3q381oci/zipekuwapebuwiwu.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210913052130_311622769.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd47c1b48a---soxulotenelaxikom.pdfIn PDF document text
    • http://tw-echen.com/uploads/files/202109070649458936.pdfIn PDF document text
    • https://idea-web.ro/app/webroot/files/userfiles/files/dunonemes.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8b6e143bc---pamebinem.pdfIn PDF document text
    • https://navoloki.mebel18.com/uploads/files/zudugisulimijumotelaveb.pdfIn PDF document text
    • http://designklasse.de/ckfinder/userfiles/files/tuxevovis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=copy+nfc+card+to+androidPDF 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_off0000b5c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5C3 10412 bytes
SHA-256: e003755649e412477e5c6ebec32875ec46673c091e6184294fcf068c8122c3fa
font_01_sfnt_off0000cd7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD7D 18184 bytes
SHA-256: 44c9205af42908dade6b7b0afac5837abc9e8be4a8cc9da8d0900c0d48a60f75
font_02_sfnt_off0000fc5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1