Malicious PDF — malware analysis report

Static analysis result for SHA-256 d71c7b82f1f41fb4…

MALICIOUS

PDF

81.4 KB Created: 2021-09-22 23:48:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b4d51a68addfc6102ee80860ae6f100f SHA-1: 4765829d7acc1bc33dbe1351ddc0eb087e3cfc15 SHA-256: d71c7b82f1f41fb4850894369a005292aac2ba4c910a04be1eb35c3c741deddf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating an attempt to disguise malicious links within a seemingly legitimate document structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://organicfertilizerproduction.com/d/files/zugijigoporiv.pdf In PDF document text
    • http://aid-calais.com/userfiles/file/80791520970.pdfIn PDF document text
    • http://snbedu.com/uploadfile/file///2021090604214226.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/31868322043.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/birenaxatofaxovaxek.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/19258589008.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/86344401826.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/wazobela.pdfIn PDF document text
    • https://yoimart.com/upload/file/20210912093729.pdfIn PDF document text
    • https://100tmt.com/uploadimage/files/20210901122950.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6e362119a---25684688213.pdfIn PDF document text
    • http://ingfrimale.com/userfiles/files/45925320488.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/85767530230.pdfIn PDF document text
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/berojo.pdfIn PDF document text
    • http://dnt-mayak.ru/content/File/82712779697.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/jiwizazefumatuxowisaxig.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/161463c6345882---xebegafojifirumipizogafov.pdfIn PDF document text
    • http://npi-management.org/ressource/site-image/files/bakogik.pdfIn PDF document text
    • https://wigs4less.net/nbloom/fckuploads/file/97170314220.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/dusemazejapobowoxosotutu.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/83895775348.pdfIn PDF document text
    • http://td-mg.ru/uploads/files/72587839976.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/22370279018.pdfIn PDF document text
    • http://nilesk.com/userfiles/file/gorivokapunuf.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/busabilajipokekuzonif.pdfIn PDF document text
    • http://sten.kr/club/data/userfiles/file/20210904010745.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=can+someone+see+if+i+look+at+their+instagramPDF 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_off0000dae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE2 17152 bytes
SHA-256: 7a82652484f0fbb85702c58269058c5f98427eb237eda439f1f74452fa0f1f10
font_01_sfnt_off000106a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011eba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EBA 10784 bytes
SHA-256: 85e2357d397b6fa8afc3fd65cf3741a2bb3e119329222449bc9a441b5f6d3c78