Malicious PDF — malware analysis report

Static analysis result for SHA-256 25b5005a0f49a6c3…

MALICIOUS

PDF

71.3 KB Created: 2021-09-15 21:06:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9ea98c60584449acc36e5e9bb509f03e SHA-1: ab870751cded6a91da1365144862cfac0915b2b1 SHA-256: 25b5005a0f49a6c38c5630230317dd09ed2f89ee4257bf01dc3904523ccb0c99
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. It contains a large number of embedded URLs, many of which point to disposable hosting and utilize UTM parameters, suggesting a phishing or link-farming scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically indicates a link farm on disposable hosting, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://oniceh.ru/uplcv?utm_term=sylvie%27s+love+online PDF link annotation
    • https://hotararicedo.ro/files/files/nakudenabarem.pdfIn PDF document text
    • https://foundationkuzmanov.com/files/jakeba.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/59548354226.pdfIn PDF document text
    • http://chayka-svg.ru/files/94854527934.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/kavalufizopufivunaxari.pdfIn PDF document text
    • http://valentine.tutaylamhet.com/storage/ckfinder/files/rujumu.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/63524396148.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/60364469880.pdfIn PDF document text
    • http://xiangzhuan.tw/upload/files/29106427103.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/16310046899.pdfIn PDF document text
    • http://rapet.hu/files/76473297028.pdfIn PDF document text
    • https://www.cifphosteleriayturismo.es/ckfinder/userfiles/files/wowubewikawupamo.pdfIn PDF document text
    • http://firsttimehomebuyerstudy.com/images/file/vamusepuwuwuwevozinop.pdfIn PDF document text
    • https://ardiinerkh.mn/uploads/userfiles/files/refuni.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/81d287d2aaf03b60dd6b3298b2df7532/15890635355.pdfIn PDF document text
    • http://web-news.eu/www/pkpar/userfiles/file/93462944893.pdfIn PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/10508610250.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/838f512c7318c53d9203300693b736e8/3352063461.pdfIn PDF document text
    • https://yunglin.com/uploadpic/files/83875473001.pdfIn PDF document text
    • https://yuktogel.com/contents/files/74158948328.pdfIn PDF document text
    • https://markaoyun.com/calisma2/files/uploads/88487579354.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/28726596618.pdfIn PDF document text
    • https://adikmanis.com/contents/files/pusawamajevizesewi.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/pelujuwixiledawem.pdfIn PDF document text
    • http://desiaussies.com/ckeditor/uploads/files/neliru.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_off0000b88e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB88E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A5 10032 bytes
SHA-256: d3c8a69d0cdd35b1c737eb68e71b9aa69b0b37032da395dcf6cc89a39fa89304
font_02_sfnt_off0000e70f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE70F 16032 bytes
SHA-256: 0e070070e2b506574befbe01d9ef73e2cc7ddf9257994f66f3c1456639273c9b

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