Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd64b0eab552d014…

MALICIOUS

PDF

82.8 KB Created: 2021-09-14 03:37:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3ceadc0f44428cf53c3ae7ffdb4b36bd SHA-1: b79180c8c5653d39bf4635cebc079d7f2b5d0ca5 SHA-256: fd64b0eab552d01407b8f104e86b704aa6336c5f44ac2c53e4f002152ad99d29
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs and is flagged by ClamAV as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links on disposable hosting, suggesting an attempt to distribute malicious content or phish for credentials. The ML classifier also strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • 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://infrive.ru/uplcv?utm_term=file+transfer+and+share+app PDF link annotation
    • http://tetrafluoro.com/upload/files/52105813567.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/10493037367.pdfIn PDF document text
    • http://floridare.ru/app/webroot/img/uploads/file/070307_venipa.pdfIn PDF document text
    • http://debrecen.varosom.hu/userfiles/files/87866556647.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/13167554496.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/00360644c2209c88486bdae3b760d66c/49519171658.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/laziwugamazupinulobeku.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/gifuzana.pdfIn PDF document text
    • http://paglialonga.it/userfiles/files/94216148069.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/bivokudi.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/zerafosonofimokaz.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3aad37516---62168082569.pdfIn PDF document text
    • http://oecschool.com/userfiles/file/78686804555.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/lukapafiwevozanadeguguwip.pdfIn PDF document text
    • http://grossbuch.com/upload/file/pewanudetiraxaniminev.pdfIn PDF document text
    • http://bocghedanang.com/media/ftp/file/sexujune.pdfIn PDF document text
    • https://zohopin.com/calisma2/files/uploads/gupeki.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/3198637467.pdfIn PDF document text
    • http://textstricker.de/benutzerdateien/4567254305.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/43956902843.pdfIn PDF document text
    • https://spandoekland.nl/userfiles/file/lokugadidinunaba.pdfIn PDF document text
    • http://www.astmalek.cz/obrazky/file/51730714337.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_off0000db9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9A 19388 bytes
SHA-256: f60c0491c0109c6cfac538c9f0ff50567cbcb491e36e9e3b0b279101aa4bc3bd
font_01_sfnt_off00010dcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125E2 10452 bytes
SHA-256: 8926d0112cbea23466d07d7413fbd67068430c74aaa5e90d6a1c762186f738be

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