Malicious PDF — malware analysis report

Static analysis result for SHA-256 f53c0d5a1c33b5aa…

MALICIOUS

PDF

81.5 KB Created: 2021-09-12 18:26:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8ce45df75fa0f8273d7594701cada9be SHA-1: 210a9abc167dc7ce08ff40bb6ce9b12ff9bc55b5 SHA-256: f53c0d5a1c33b5aa9bee928994e1bc1b6a129ef63041464d9792ce6cdf656168
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, and contains numerous embedded URLs pointing to link farms. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a high likelihood of this document being used to redirect users to malicious sites. No scripts were extracted, but the structure suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://bpabv.nl/uploadfiles/file/36830173694.pdf In PDF document text
    • http://dyneco.kr/userData/board/file/pawujefijifese.pdfIn PDF document text
    • http://gjbbang.com/userData/board/file/sutezokejiziz.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/47100847807.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/21569300038.pdfIn PDF document text
    • http://tiquital.com/documentos/file/45936850797.pdfIn PDF document text
    • http://afro-safari.com/upload/files/19554121287.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/37792178344.pdfIn PDF document text
    • http://aaas.handyfriendship.com/upload/files/pededamedo.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/81268429357.pdfIn PDF document text
    • http://rabotatver.ru/userfiles/admin/bakulinuzerilogefinot.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/vozevemulajibajidisasoma.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202109022331174650.pdfIn PDF document text
    • http://flamefitnessstudio.com/cewit/images/file/feridaxame.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16138dd4cf3eca---rirapagaxaturaso.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/sukexovotidelo.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/74987817980.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/26245391096.pdfIn PDF document text
    • http://tsraccountants.nl/mailing/images/photo/file/visexaresabegebivin.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/sopovatidovaduzevikaved.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/972fb6ecf869e5b6bfde9d27ea30c2e0/vexofome.pdfIn PDF document text
    • http://www.centralperdana.com/file/tizebelavuridun.pdfIn PDF document text
    • https://buzascsaba.hu/userFiles/file/97340899326.pdfIn PDF document text
    • https://tanhoaphat.vn/userfiles/file/nopifirakakumupi.pdfIn PDF document text
    • https://bushregenerators.com/userfiles/files/selojefub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=slang+words+that+start+with+fPDF 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_off0000d882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD882 18312 bytes
SHA-256: 5f4b05fb3f4964336e1fe4e45cdc2675aadf89bc9ac07dfe1ada1d7a6edcf15c
font_01_sfnt_off0001080d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12024 10664 bytes
SHA-256: e9e9583769ecf22fc915dfd0dfc2caa570513f19bead6d1255088ee40493a25f

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