Malicious PDF — malware analysis report

Static analysis result for SHA-256 659a5cc2d264d3fe…

MALICIOUS

PDF

81.2 KB Created: 2021-09-10 05:52:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 685ab2b0c8e6b1fa93a4332a5c5cab9a SHA-1: 5f5890c6f9036ad6421be568920181ee36914b18 SHA-256: 659a5cc2d264d3feebc402eb878c9a2667bc329283692e9b70c428a7848ad2de
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on disposable hosting, with numerous embedded URLs pointing to PDF files. This suggests a phishing or malware distribution scheme, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://ozhelalikram.de/resimler/files/98050887151.pdf In PDF document text
    • http://sweepinstyle.com/userfiles/file/66424230310.pdfIn PDF document text
    • https://reitinguok.lt/userfiles/file/kiziniresaligojuwepelowe.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/toxovid.pdfIn PDF document text
    • https://hoavily.com/uploads/files/97283734853.pdfIn PDF document text
    • http://hunting.kg/userfiles/file/701278160.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/tozejenoluguzaroz.pdfIn PDF document text
    • http://coaching-scolaire.net/userfiles/file/26076685589.pdfIn PDF document text
    • http://cermak-expo.cz/data/files/file/tezuvutedujofukuje.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/36098053608.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613692230b24f---31403828146.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/pewekofemejimob.pdfIn PDF document text
    • http://ky-auto.com/uploadfile/files/wakiparesumavesida.pdfIn PDF document text
    • https://www.disbel.es/ckfinder/userfiles/files/goguwubazepujujowegogupef.pdfIn PDF document text
    • https://maydangson.com/vietkiendo/upload/file/fibixivujuwokuj.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/zumozaxo.pdfIn PDF document text
    • https://westhigienia.hu/editor_up/vabupa.pdfIn PDF document text
    • https://piphoto.tw/uploads/files/202109060052139130.pdfIn PDF document text
    • https://fong-cai.com/upload/files/guxasosevi.pdfIn PDF document text
    • https://clicksnepal.grnca.org/img/files/files/45339385423.pdfIn PDF document text
    • https://granitnet.hu/editor_up/susevup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=mxq+pro+4k+custom+romPDF link annotation
    • http://louisiana-arts.org.s150269.gridserver.com/siteuploads/editorimg/file/50200956696.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_off0000d78d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78D 18292 bytes
SHA-256: 8c9e5c668803d610c0f80a053b3adf1b1361e7e6bc7c5cdb23094e7fb7394e12
font_01_sfnt_off0001071c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1071C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F33 10508 bytes
SHA-256: 1c1f31e814fb7bba9001c4cdb702b9d00a1a956449a4db4285297b249eca5823

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