Malicious PDF — malware analysis report

Static analysis result for SHA-256 e319a565b7ed0c56…

MALICIOUS

PDF

86.9 KB Created: 2021-09-10 13:44:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 39e41d9dc298d504b4548fd7a047f40a SHA-1: b11d258e9af44b25a58ff2692f1b87604dc47959 SHA-256: e319a565b7ed0c567b2bb94e05ebc67a1b68d32979e97a0c276f67b3191ae108
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate an attempt to obscure the final malicious destination. No scripts were extracted, but the overall structure and heuristic firings point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://dadesigning.com/daduserfiles/files/nupavofo.pdf In PDF document text
    • http://dentherapia.hu/files/file/rotutedana.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/xamuk.pdfIn PDF document text
    • https://portecitadelle.portecitadelle.ca/ckfinder/userfiles/files/muniba.pdfIn PDF document text
    • http://studioarchoggianiepartners.it/userfiles/files/39536810162.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/34377804187.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/rududifevu.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/39613137099.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/fabuguwojumonozevogobuv.pdfIn PDF document text
    • http://daiichibus.vn/uploads/news_file/6224158305.pdfIn PDF document text
    • http://apmnir.ro/fckfiles/file/guwakuximajagelowiso.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/gunumobumigu.pdfIn PDF document text
    • http://anquocrealty.com/uploads/image/files/71239443518.pdfIn PDF document text
    • https://espritgt.com/userfiles/file/zipemolutudagiwotekafusiw.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/lezile.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ca687a799---65139714122.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613710d085ccb---wudisawow.pdfIn PDF document text
    • http://z500.si/files/48307561168.pdfIn PDF document text
    • http://myslizdrave.com/soubory/15422335936.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/bojakikufufasarasupozevij.pdfIn PDF document text
    • https://malinaionescu.ro/userfiles/file/jolamudobezodujifuvusof.pdfIn PDF document text
    • https://vinatech.com/userfiles/file/kuliwujefegot.pdfIn PDF document text
    • http://teamtrinity.net/trinitya/file/94813799427.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=samsung+galaxy+bloqu%C3%A9+compte+googlePDF 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_off0000e6b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B3 11356 bytes
SHA-256: c95fc8e67a2622e9e4a47875ed0342eccb647603b74f2dc1181431916fe604b2
font_01_sfnt_off000100a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A8 20264 bytes
SHA-256: a9e8e5d5cd1c3e20c322be8a62ec4164b0b93d0149549328191abda195bfe9e6
font_02_sfnt_off00013413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13413 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.