Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c8a7cb5bbd53f4a…

MALICIOUS

PDF

84.1 KB Created: 2021-10-26 14:45:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2e54555e3ba43a462969ec4e0ad28bec SHA-1: e8e7525c78853b38de1d56e8048f57ec3fad7af4 SHA-256: 1c8a7cb5bbd53f4ab62ec4eb333be442a53a600852107eb754155760c3a6cd85
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous external URLs, with one heuristic identifying it as a link farm on disposable hosting, suggesting a phishing or redirection attempt. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to lead users to malicious external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1616eb116c707e---zigoxa.pdf In PDF document text
    • https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/16376596875.pdfIn PDF document text
    • http://intimatehotelpattaya.com/image/upload/File/panepifilifufix.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/gijizalanababizomokifex.pdfIn PDF document text
    • http://coaching-scolaire.net/userfiles/file/babemiz.pdfIn PDF document text
    • http://hatowo.com/app/webroot/uploads/files/zutim.pdfIn PDF document text
    • http://avtrak.ru/ckfinder/userfiles/files/noxununowibugo.pdfIn PDF document text
    • https://aparcaderoshaddaichile.cl/uploads/images/files/makufefo.pdfIn PDF document text
    • http://nzozkrowodrza.pl/uploads/editor/file/8335161527.pdfIn PDF document text
    • http://rejs2013.cycling-recycling.eu/imgturysta/files/minimokekiwegi.pdfIn PDF document text
    • https://kmkmekanik.com/upload/ckfinder/files/devosiw.pdfIn PDF document text
    • http://nepalbestcargo.com/userfiles/file/zarekel.pdfIn PDF document text
    • http://kusistoconstruction.com/userfiles/file/50381431735.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/pafisu.pdfIn PDF document text
    • https://www.confirmedtour.com/files/24408841589.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/jubuvi.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/37699358971.pdfIn PDF document text
    • https://wangwangcamp.com/uploads/files/202109290416347157.pdfIn PDF document text
    • http://h04ydivan.ru/userfiles/file/sikaxijitetuto.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16145c535732df---37454706226.pdfIn PDF document text
    • http://usefchina.com/uploadfile/file///2021100317015958.pdfIn PDF document text
    • https://sieuthimayphat.com/ckfinder/userfiles/files/febusosobon.pdfIn PDF document text
    • http://webcertain.asia/contentupload/fckeditorUploads/organization_/file/31043017051.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/15773920538.pdfIn PDF document text
    • http://cplust.com/upload/serback/files/20211025125024.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/BGAemAmcdTc/uplcv?utm_term=conciliation+arbitration+and+mediationPDF 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_off0000e7f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F2 10532 bytes
SHA-256: 56822cb7ffdc4dc23502ac2b4e345ac1358bd47051bd224567f7d0393be7174b
font_01_sfnt_off0000ffe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE9 16504 bytes
SHA-256: 833b58a618806c9bc49ad5e10e5c38e7ff0a35a5033f9ed4e4685a4a768f6d97
font_02_sfnt_off00012a78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1