Malicious PDF — malware analysis report

Static analysis result for SHA-256 747cd6b17abb11dc…

MALICIOUS

PDF

81.4 KB Created: 2021-09-23 16:52:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 64e025b08c700dc4f97dd4e0c22b7266 SHA-1: 1879999e694d2514d4130b3ea71576c068efa07a SHA-256: 747cd6b17abb11dc238467504c34677264038f28f689efd067f72aac968d6a62
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attack pattern involving redirection to potentially harmful external sites.

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 http://www.coverseg.com/uploads/ckfinder/files/livowatesap.pdf In PDF document text
    • http://kawoka.com/userfiles/file/38395097197.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161423976b7131---tijatopemejapoxu.pdfIn PDF document text
    • https://siahotel.com/userfiles/files/lafigaso.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/xukomepupokezusakewozufo.pdfIn PDF document text
    • http://defhjdr.friend-match.com/upload/files/36280589987.pdfIn PDF document text
    • https://cet.sk/res/file/64885142161.pdfIn PDF document text
    • http://konstruktor33.ru/app/webroot/files/files/31680328753.pdfIn PDF document text
    • http://baggiez.net/userfiles/file/dikadosesenobesuloxu.pdfIn PDF document text
    • https://buildingexpertsdirectory.com/ckfinder/userfiles/files/rekosunitebisijaket.pdfIn PDF document text
    • http://retailcop.ca/files/82671971358.pdfIn PDF document text
    • http://hwangtosidae.com/userData/ebizro_board/file/9114581922.pdfIn PDF document text
    • http://saveursetsavoirs.fr/image/file/64808438575.pdfIn PDF document text
    • https://lifeteacher.tw/uploads/files/202109161558557166.pdfIn PDF document text
    • http://rklatex.com/userfiles/file/55719380134.pdfIn PDF document text
    • http://jarauwerdaenzn.nl/userfiles/file/20737572958.pdfIn PDF document text
    • http://aromata.ru/upload/files/sadukidupubugibeku.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/gasevujux.pdfIn PDF document text
    • http://avanti-kuhni.ru/upload/files/dukovavuta.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/36411357894.pdfIn PDF document text
    • https://z87992961.com/upload/files/20210920105103.pdfIn PDF document text
    • http://mylivediamondinventory.com/uploads/files/mofododixogijotimekora.pdfIn PDF document text
    • http://midospa.com/upload/files/kukimopojusikanidifofe.pdfIn PDF document text
    • http://thietbibepnhahang.net/media/files/rozurotegonefej.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16138170646cac---9620350461.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/11849272040.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=sum+of+arithmetic+progression+formulaPDF 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_off0000d711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD711 17972 bytes
SHA-256: 48a4660c6bfbc34bcfca9efa4b4143707358ad87aba21266d9b5bf5ca2cd1289
font_01_sfnt_off000105dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011df4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF4 11100 bytes
SHA-256: 1a1f67920ab2940ebb5adf84132d3d978afa9b916444170bab2ef612bcedcb22