Malicious PDF — malware analysis report

Static analysis result for SHA-256 23c11b7e0c885be5…

MALICIOUS

PDF

83.2 KB Created: 2021-09-11 22:51:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f5b9fce795d56130d3344575000fb0a9 SHA-1: d754fcdd497a73cd2787a0556f654ba6dd0a3d07 SHA-256: 23c11b7e0c885be5a18d59a91fe419986f2ea2b159c3d41d7a5256e4f317b1a7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous external URLs, one of which is a known malicious domain. The document body is heavily obfuscated, but the presence of embedded URLs and the link farm heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • 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.
  • 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://crysiq.ru/uplcv?utm_term=how+to+download+android+emulator+on+pc PDF link annotation
    • http://czytamzezrozumieniem.pl/userfiles/file/futibolupafufibapano.pdfIn PDF document text
    • http://archiw.bibliotekalesmierz.eu/img/upload/files/61337465955.pdfIn PDF document text
    • https://mccartha-cobb.com/userfiles/files/164456582.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/13527848947.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/lenezedafezitela.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/mavupegoligegelod.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/xubinedepatutexebozuwa.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-2/20210902220911304919.pdfIn PDF document text
    • https://tarsiman.ee/files/file/gebudajozilu.pdfIn PDF document text
    • https://francemonde.news/UserFiles/file/12142316830.pdfIn PDF document text
    • https://ags-car.60km.com/upload/files/41044707434.pdfIn PDF document text
    • https://ceccardolj.ro/userfiles/file/tivesuwovusitikazes.pdfIn PDF document text
    • http://newo.ru/files/files/tejodajasiminukuni.pdfIn PDF document text
    • http://lombardpruszkow.pl/local/userfiles/file/rokazepawawivowikube.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/kavobiji.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131712d798f3---84487135297.pdfIn PDF document text
    • https://rmduncanrealty.com/userfiles/files/85897478538.pdfIn PDF document text
    • http://daiichigroup.net/uploads/news_file/xanimoxefamolenidumafogaf.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303b94434dd---wegodapejofesejumuzawu.pdfIn PDF document text
    • https://calprin.com/ckfinder/userfiles/files/75050028504.pdfIn PDF document text
    • http://nifaelectronics.com/userfiles/file/28975113099.pdfIn PDF document text
    • http://polesprogettazioni.com/userfiles/files/44505225163.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_off0000e106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE106 10684 bytes
SHA-256: 13ee2ce2179aeac662aa96d799a89278c8a7fc94ee87a744db33f037e19b0047
font_01_sfnt_off0000f972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF972 17676 bytes
SHA-256: da79ad070be653f1e85ee3ab09b06f1dffffb302a6e0d6aaaf0979c709212505
font_02_sfnt_off000126f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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