Malicious PDF — malware analysis report

Static analysis result for SHA-256 90a1ee53834cd081…

MALICIOUS

PDF

75.8 KB Created: 2021-09-27 22:06:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 57fb0b15e8dd9631e670058a07296143 SHA-1: 06bb0467c5eec802c6570c6e2eb60654439270d3 SHA-256: 90a1ee53834cd081695251e82a4f91153b402f8a3e8e1c80d4d1b7fb36cc18cc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, and one heuristic identified it as a link farm. The primary attack pattern involves directing users to a collection of external PDF files, likely for malicious purposes such as distributing further malware or conducting phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.fuchingrading.com/upload/file/25636442155.pdf In PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/guganava.pdfIn PDF document text
    • http://knx-shop.ru/admin/ckfinder/userfiles/files/patajonezotasafe.pdfIn PDF document text
    • https://mmszke.hu/files/file/wuwuv.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/161445fc4edcba---wuzutinojuxa.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/vemixufeludagumimasaki.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/22760848014.pdfIn PDF document text
    • http://clinton.abwingsmd.com/uploads/files/sojonevupalolowawavarero.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/12748107137.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/16336736658.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/74770947366.pdfIn PDF document text
    • http://nirmalamathachurch.org/cms_uploads/image/file/lopadux.pdfIn PDF document text
    • http://hanlacsclub.com/ckupload/files/winapu.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/76290799142.pdfIn PDF document text
    • https://contemporaryteas.in/admin/uploads/file/xefikexo.pdfIn PDF document text
    • https://mujeresenmovimientoplus.com/userfiles/file/xoxebibaluxovupofuduvug.pdfIn PDF document text
    • https://waxparadise.pl/userfiles/file/36969443281.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/kunezodi.pdfIn PDF document text
    • http://dar-tom.pl/userfiles/file/nitasutewizuriwutalel.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210918154636_gc23v1.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/73271873526.pdfIn PDF document text
    • https://robodom.si/files_vsebine/norupukalixamipapewewo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=the+little+prince+by+antoine+de+saint+exupery+pdfPDF 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_off0000bf4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF4C 11136 bytes
SHA-256: a8b19f40891d1a0208cf267b9184fc3a3a82d682045c2293a7d8f031efc52164
font_01_sfnt_off0000d906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD906 18492 bytes
SHA-256: 2f977884c66066e4c9d7390cce1781809e3a8f5b32727aaa97a6ff5c1338c5df
font_02_sfnt_off000108ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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