Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8547f9a1b457959…

MALICIOUS

PDF

73.6 KB Created: 2021-10-04 12:46:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5c656e55abf705b7867e53d73c886dee SHA-1: 8908d36b2f8f425b88edcbeb1532e498e27a594b SHA-256: d8547f9a1b45795984c5d68eb7f545e6e222c01fef2840e09c71facab17162d3
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and form a link farm, a common tactic for distributing malicious content or conducting phishing campaigns. The `PDF_SEO_DISPOSABLE_LINK_FARM` heuristic confirms this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 5

  • 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.
  • 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://criminisiepartners.it/userfiles/files/72934984592.pdf In PDF document text
    • http://abwrosedale.com/uploads/files/701459200.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/gawujupewexu.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/xedutabubuxufez.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-12/20210912174945605942.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/domagixuve.pdfIn PDF document text
    • https://zenmobile.in/jaipriyart/uploads/files/29515731433.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/68129410280.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/23460512508.pdfIn PDF document text
    • https://galantemontagnana.it/ckfinder/userfiles/files/supurirodamukemofa.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/73005205273.pdfIn PDF document text
    • http://frutapacargentina.com/ckfinder/userfiles/files/fukovexidinuripu.pdfIn PDF document text
    • https://akconta.com/uploads/files/84822950465.pdfIn PDF document text
    • https://bc2000.order-pro.com/ckfinder/userfiles/files/vozofokifekijekowudugejum.pdfIn PDF document text
    • https://vietrocknet.org/app/webroot/img/files/39883458245.pdfIn PDF document text
    • http://staceyasp.com/UserFiles/file/xugibujajak.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/98627205472.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a499d3f85d---mupudefapezenijovogusefo.pdfIn PDF document text
    • http://haokunchem.cn/upload/files/mirigikemofe.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cbcb043bb5---jaropo.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/36760548742.pdfIn PDF document text
    • https://thebottombillion.com/business_school/uploads/file/13678437207.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=all+in+one+science+class+8+pdf+downloadPDF 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_off0000bc0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD420 17496 bytes
SHA-256: 7932a73424533fd402e080e64c608c40334b51a622cdf07f1109a609e997d1b2
font_02_sfnt_off00010059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10059 10692 bytes
SHA-256: 2fcf898d9bba17483798684d218b62f2db2b7ef8a62fcdbe182eefa84da1925f

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