Malicious PDF — malware analysis report

Static analysis result for SHA-256 d54d8d25c19afc8b…

MALICIOUS

PDF

76.7 KB Created: 2021-09-22 22:18:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3b9aa64474bf24e78f78f1cc3bf10cd6 SHA-1: a04d24f7b59a489f3ebf89bc554e6816748307da SHA-256: d54d8d25c19afc8b17ba921cdf73415f56ac754cc391051157cf375a41a5ec3d
126 Risk Score

Malware Insights

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

The file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs pointing to various domains, suggesting a link farm or redirection mechanism. The PDF structure and embedded links indicate an attempt to direct users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://wastran.ru/uplcv?utm_term=application+android+pc+portable PDF link annotation
    • http://md-servicios.com/userfiles/file/rasejabuzaxeta.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/kenirifozupasuvo.pdfIn PDF document text
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/gezewoge.pdfIn PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210912_0F8825FEEBC92C84.pdfIn PDF document text
    • https://spvi.cn/filespath/files/20210906205015.pdfIn PDF document text
    • http://xlpe.net/Images_upload/files/powaripejozuvi.pdfIn PDF document text
    • https://khmernative-rice.com/userfiles/file/67007979225.pdfIn PDF document text
    • https://kligi.viart.lt/ckfinder/userfiles/files/35519414146.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/kabipenujezul.pdfIn PDF document text
    • http://tajesink.com/Uploadfiles/files/wobojazo.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2ecf2068c---rerenamasomigaparu.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/kaxenufedufokizibe.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/kisuzogimipasesazan.pdfIn PDF document text
    • https://www.oalysa.cz/ckfinder/userfiles/files/letefawisoxoxetimowonekif.pdfIn PDF document text
    • http://abwferrellpkwy.com/uploads/files/fimilagunedodegebareve.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/18038515480.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/dr4jolh8762et6a8jme36k6itv/49022685921.pdfIn PDF document text
    • http://newshop.jp/archive/file/xedariromiwir.pdfIn PDF document text
    • https://www.almuhja.com/ckfinder/userfiles/files/65401166475.pdfIn PDF document text
    • http://branpc.in/ckfinder/userfiles/files/dajanefamisosome.pdfIn PDF document text
    • http://edukoc.net/userData/ebizro_board/file/dopesogadojurasivujijat.pdfIn PDF document text
    • http://domario.ru/userfiles/file/11199649767.pdfIn PDF document text
    • https://bharatceramics.in/ckfinder/userfiles/files/66183626383.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/11865374580.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/vorenaselabad.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_off0000c6c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6C5 10460 bytes
SHA-256: 3b9bc12f8892916e35fde922c971552fd94b71b1106beba6fb270745779031d6
font_01_sfnt_off0000de6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6A 17956 bytes
SHA-256: 6c9191ffd7c0471415e8dcff307d990b0ae32e2419283c8b86fc6d68ebc72d1f
font_02_sfnt_off00010d51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1