Malicious PDF — malware analysis report

Static analysis result for SHA-256 76fc5626878705de…

MALICIOUS

PDF

74.3 KB Created: 2021-09-19 12:47:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: c9a8245c106e4e269f12bc79e3369295 SHA-1: 0030dff3432fc4858a3c3532d3bfb56c8ec3bd9e SHA-256: 76fc5626878705de52411832a75fdbe10f092891d576c03646aeeb5c7c8cf597
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a link farm with numerous URLs, many of which are hosted on disposable domains, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://adria-ex.com/images/blog/file/lopekobug.pdf In PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614062a866156---48398643574.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/tobejezukeposudeb.pdfIn PDF document text
    • http://www.southpointinstitutehowrah.com/admin/uploads/file/gefofobexefuzux.pdfIn PDF document text
    • http://www.fishandcosolicitors.com/uploads/files/gesogeborazapukabaf.pdfIn PDF document text
    • https://chennothinterios.com/uploads/file/katusemalafa.pdfIn PDF document text
    • https://machinex-machines.com/UserFiles/File/87979325710.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/71373464399.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/625651387.pdfIn PDF document text
    • http://islenapuntos.com/campannas/file/xobezamamuxaradu.pdfIn PDF document text
    • http://rm-centr.ru/uploads/file/tejega.pdfIn PDF document text
    • http://climtech.com/files/files/suvudarimoxup.pdfIn PDF document text
    • http://daiquangsico.com/img_duhoc/files/57318857828.pdfIn PDF document text
    • http://metall-press.ru/files/ritijixisoluzilawobitom.pdfIn PDF document text
    • https://pgprojekt.pl/Upload/file/81565656398.pdfIn PDF document text
    • https://sayurmateng.com/contents/files/tujosedipavopurazufanufes.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/40113628369.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/xugodofoxinojeko.pdfIn PDF document text
    • http://kleiberit.ru/files/file/bepojele.pdfIn PDF document text
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/sesinarojoma.pdfIn PDF document text
    • http://uptownfallschurch.com/uploads/files/fetorodisal.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/zowunejawinevuwijeni.pdfIn PDF document text
    • http://cmorshomecareassociates.org/uploaded_files/userfiles/files/xepeberadalofofimatipu.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613022d627f5b---75273777074.pdfIn PDF document text
    • http://bcslaw.hu/admin/fck_upload/file/83499778163.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=st+joseph%27s+church+moorebankPDF 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_off0000bcfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCFE 11072 bytes
SHA-256: fa0be42c9b0509c75dc61a2ee2418a1ccd855adad8b7cfc9eb635f78a403a2c8
font_01_sfnt_off0000d67c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD67C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8E 17388 bytes
SHA-256: bb864e47d0a8a0d8c09dbcd894a9b90182ae76ace8231f0fc1288ae118c9b10d