Malicious PDF — malware analysis report

Static analysis result for SHA-256 90309659bc1522da…

MALICIOUS

PDF

76.4 KB Created: 2021-09-13 07:30:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ea375449d0a726596dd4f2e1a1b2844d SHA-1: 28a1af598fa5221cfa588ea54fc7f48055ab0f7e SHA-256: 90309659bc1522da24226ec2aa46116cac9cb4d1bd5aa0138f0db2cdfbdb4a26
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs pointing to various PDF files on different domains, suggesting a link farm designed to obscure the ultimate destination or to host multiple lures. The presence of 'utm_term_redirector=True' in one of the URLs further supports the idea of redirection for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://ngaa.org.au/application/third_party/ckfinder/userfiles/files/fijudakagow.pdf In PDF document text
    • http://banglenhospital.com/UserFiles/File/tinomodo.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021090414015473499.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/21726487300.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/mivedo.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/72531635042.pdfIn PDF document text
    • http://feuerwehrobrigheim.de/upload/files/vozenapunuto.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/timigopi.pdfIn PDF document text
    • https://flomogroup.com/upload/files/60570381110.pdfIn PDF document text
    • http://kbcsisa.com/upload/fckeditor/file/30098687606.pdfIn PDF document text
    • http://lineshare.net/upload/files/20210913065919.pdfIn PDF document text
    • https://accidentmatters.com/ckfinder/userfiles/files/12746511035.pdfIn PDF document text
    • https://hygradeinsulators.com/images/uploads/file/naweli.pdfIn PDF document text
    • https://napraforgohotel.hu/upload/file/tafiwuvew.pdfIn PDF document text
    • http://adwokaci-pila.pl/userfiles/file/7606424739.pdfIn PDF document text
    • http://npas.ru/pic/file/74199524774.pdfIn PDF document text
    • https://campfun.myhost888.com/upload/ckeditor/files/6454728142.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/90693515935.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/37992296153.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/2593466103.pdfIn PDF document text
    • http://innotack.com/userfiles/files/93179781387.pdfIn PDF document text
    • http://kyochonbuenapark.iorderfoods.com/uploads/files/68904332054.pdfIn PDF document text
    • http://jimsclub.net/new/board/img_tinfo/file/20210902135431.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16136b3ba0e101---13217542233.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/28352867114.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=mobile+movie+hd+720pPDF 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_off0000c530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC530 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD47 10516 bytes
SHA-256: b4031539d87700b89890774364f86d45f4ca96f736d382ae65d39f6c648c10a3
font_02_sfnt_off0000f4fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FC 18140 bytes
SHA-256: 7f801cc22b39a071f43f3d7fd93ff041293cdd8c011be51460ad004f4e1f71bc