Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f8e14dfece63ff1…

MALICIOUS

PDF

85.2 KB Created: 2021-09-19 10:47:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 8c5a95d1691b89ffce20a6ee605fa772 SHA-1: 86f37c3ea40985f884217b1f19fee557504c3593 SHA-256: 1f8e14dfece63ff1a834a288733a1b52a178b2c49a5acd526455bfc2f6d57d32
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate maliciousness. It contains numerous embedded URLs, with heuristics identifying it as a link farm on disposable hosting. The document body is heavily obfuscated, preventing analysis of its specific content, but the overall structure and URL distribution strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://cructi.ru/uplcv?utm_term=wallpapers+of+android+phones PDF link annotation
    • https://megalight.lv/uploads/files/47401933178.pdfIn PDF document text
    • http://madinagirls.com/easydo%20v2.00/files/uploads/zevoxegezerokejib.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613f69d9d0f1d---71696860885.pdfIn PDF document text
    • https://xylemleads.com/userfiles/file/15998776519.pdfIn PDF document text
    • http://goodlife88.com/uploads/files/91957214946.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210911224857_MzU3Njk4NDQxMzI=.pdfIn PDF document text
    • https://inprovitargentina.com/ckfinder/userfiles/files/sedorarefano.pdfIn PDF document text
    • http://synhbio.com/upload/files/wavetixifal.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/tiripe.pdfIn PDF document text
    • http://gyn-ordi.at/myPix/file/wotetoxakemupotunid.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/38r3anjd13n6js3ur08vb1u4ge/35833527437.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/xelojepamozezutolu.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/68467266887.pdfIn PDF document text
    • http://civicwomen.com/ckfiles/files/jevam.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/belefebasuzero.pdfIn PDF document text
    • http://jiachuankeji.com/upload_fck/file/2021-9-2/20210902123746227508.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/52868967834.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/75928861738.pdfIn PDF document text
    • http://henskeschildersbedrijf.nl/upload/kojepikanapumajune.pdfIn PDF document text
    • http://votejoedestefano.com/editorData/file/7532147383.pdfIn PDF document text
    • https://manhalhealing.com/userfiles/file/83412003262.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/morikenomifemufije.pdfIn PDF document text
    • http://www.gc-antey.ru/ckfinder/userfiles/files/zilidokije.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_off0000e892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE892 17696 bytes
SHA-256: f9b2785378d9ffeb25fb869c28dcff90a4eb14aad6bd3572c8e66511a6b9f393
font_01_sfnt_off000116f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F4 10488 bytes
SHA-256: 2248438b02afe0f18ed70ec0f0df3867d73f159cb2066d7234aa6a423329f66a
font_02_sfnt_off00012eab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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