Malicious PDF — malware analysis report

Static analysis result for SHA-256 587ad19619cc2ddb…

MALICIOUS

PDF

94.0 KB Created: 2021-09-09 13:10:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 9d817c22a68e3bd4f0ab5ec15d3e53a9 SHA-1: e81c175bda23f601a3c735d30537091187eadd1d SHA-256: 587ad19619cc2ddb29089b5ecb1cfd50adb8872fbc7a8c5d1513ad90b1a2a1d0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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 https://pixomot.ru/uplcv?utm_term=pokemon+card+rarity+checker PDF link annotation
    • https://rafaellopezehijo.com/upload/files/1850724762.pdfIn PDF document text
    • http://b40555.handyfriendship.com/upload/files/35131278350.pdfIn PDF document text
    • https://satellietgroep.nl/userfiles/files/24807478916.pdfIn PDF document text
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/38772369782.pdfIn PDF document text
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/50614566072.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/97846870223.pdfIn PDF document text
    • https://agri-mal.pl/userfiles/file/muwora.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210907_7A0FF4C36D204DE1.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/polunuzekeviduzuzoregano.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/xipepibivanam.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/62895428677.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210906162529.pdfIn PDF document text
    • https://onecre.com/images/content/files/movulawezawolomu.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613744ed8681c---sawokiromonodovagufo.pdfIn PDF document text
    • http://zenobiacultura.it/userfiles/file///9668582762.pdfIn PDF document text
    • http://paletydozahrady.cz/ckfinder/userfiles/files/wokivagidokiwevulen.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/ralugosefiboliwi.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/83107072130.pdfIn PDF document text
    • http://greensquares.in/userfiles/file///65413836648.pdfIn PDF document text
    • https://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/73459471879.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/535110949.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/161316fe228a82---80722236283.pdfIn PDF document text
    • https://t-groupvnxkld.com/uploads/news_file/55262496889.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_off00010124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10124 10628 bytes
SHA-256: 8903bb535d84b70c97bb85e94353bb98ff2832f7ddaed59ede915ea6ea9eb4b7
font_01_sfnt_off00011947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11947 21996 bytes
SHA-256: 0d205c9cfac759463c80d2dedc1f5735c93bc3946188c24d2d307cb1b1e9fb9d
font_02_sfnt_off00015254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15254 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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