Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd4d59bddc9df9ea…

MALICIOUS

PDF

75.1 KB Created: 2021-09-24 19:43:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 23f0c57d1ea97803f5c484e1a732e860 SHA-1: 240fa32138b9748bff26d1fac8da91fd4351bf25 SHA-256: dd4d59bddc9df9ea29475d8a90c10844989600da9e93faca45d026462f714904
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It functions as a link farm, containing numerous embedded URLs pointing to external websites, likely to lure users into downloading further malware or submitting sensitive information. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this malicious purpose.

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 https://infrive.ru/uplcv?utm_term=como+descargar+super+mario+bros+para+android PDF link annotation
    • http://huyndaicaudien.com/upload/files/61596322224.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/21403463202.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/81914187293.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/mipaxerubadopi.pdfIn PDF document text
    • http://inwama4.vn/webroot/img/files/78962362361.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210913030932.pdfIn PDF document text
    • http://laskod.hu/userfiles/file/87832734645.pdfIn PDF document text
    • http://ahknchem.com/upload/files/74909414931.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/4es69nf93eao7do2ghhdk8ji7l/gagidubepevavopadik.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/siborazesadipunetabefuli.pdfIn PDF document text
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/20031429640.pdfIn PDF document text
    • http://www.psyforyou.nl/upload/fckeditor/file/palinevinusaxudage.pdfIn PDF document text
    • http://sevvalturizm.com/rsm/files/fozerumewepakoxuboniduxok.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/40058919868.pdfIn PDF document text
    • http://letnaterasa.customreal.sk/data/files/77092872754.pdfIn PDF document text
    • https://3rproject.eu/ckfinder/userfiles/files/jesetozajigozerefo.pdfIn PDF document text
    • http://itaxabc.com/userfiles/file/20210916133026_175282405.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/suroxilufazitalijugid.pdfIn PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/nexodunofiwa.pdfIn PDF document text
    • https://happycolaborativo.com/uploads/files/tilubeginizisexolefepi.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/rojopalebag.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613b089f92805---jimumivepamujuvifupedax.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_off0000bb9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB9F 10984 bytes
SHA-256: ef418674325afd707825f4327cdec8680e8d0ead021e511d3adf86ca84f3513b
font_01_sfnt_off0000d4aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ecbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBC 19188 bytes
SHA-256: 1b639d0da73fff4a15276281a22c2e8db7d5f96e6f4f2e9160fc895d61d978ed

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