Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d3c1b4b01bbf5e1…

MALICIOUS

PDF

80.2 KB Created: 2021-09-18 17:52:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5c0676dd989a1e4e0b83f95c8a7f5f8f SHA-1: bb156de99b7ca7a91763dac70c56271938956c45 SHA-256: 1d3c1b4b01bbf5e1ea845360d6724e40fa8500a8b16497c7ea8f59e6e734a9cf
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic analysis identified the document as a link farm, containing numerous links to other PDF files hosted on distinct domains. This suggests a phishing or malware distribution campaign, where the initial PDF serves as a lure to redirect users to potentially harmful content.

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 http://sanzmendia.com/userfiles/files/47379043891.pdf In PDF document text
    • http://blesk-stroy.ru/userfiles/files/11073654809.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/nemokikokemakapemupopamol.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/1354296820.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/mapuleruborazesabu.pdfIn PDF document text
    • https://megacook.pt/site/upload/file/datorokenujebi.pdfIn PDF document text
    • http://mobil-tech.com/files/10506428809.pdfIn PDF document text
    • http://nbkhjc.com/uploads/202109/file/210904090044918592artvnoy2n1g1.pdfIn PDF document text
    • http://96stone.ru/userfiles/file/zanijiserifaro.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/1610d2dc69dbba055b206b47975d6295/pizevenifakafanogelexon.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210911_2B4C9746380B17E5.pdfIn PDF document text
    • https://pilot-nav.com/ckfinder/userfiles/files/31058725887.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9a358bb5b---51049434828.pdfIn PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/woxomunodikikakidiruga.pdfIn PDF document text
    • https://fitness-sport.it/userfiles/file/7932409256.pdfIn PDF document text
    • https://ismet.com.br/ckfinder/userfiles/files/tarefodinoratogelameg.pdfIn PDF document text
    • https://kokomanis.com/contents/files/lixonagewipepedetumokor.pdfIn PDF document text
    • http://www.saito-ken.jp/userdata/file/53939090312.pdfIn PDF document text
    • http://vce34.ru/attachments/file/mowimosazubojorimifa.pdfIn PDF document text
    • http://vuason.vn/upload/files/95793984438.pdfIn PDF document text
    • https://carlojans.com/cms/file/famurudofe.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/buwonunafexuz.pdfIn PDF document text
    • https://bdprescription.com/ci/userfiles/files/xupojuri.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/netedifenekuli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=beast+virtual+space+apkPDF 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_off0000d1a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BF 10452 bytes
SHA-256: d377a86be8a2b7a15d1aff43762b0f6149a07039d8e1b94ca6a6c8bd9f442de8
font_02_sfnt_off000101ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101AC 19100 bytes
SHA-256: aea75714500eec5735b87925946b55f5e90dc8d5c18cd440a9d78a422cc05d02