Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5fb504fd4528005…

MALICIOUS

PDF

69.2 KB Created: 2021-10-02 16:51:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7b5303f0a399a9624d810adc323bb496 SHA-1: b93d4a846d19d685d3e2c4d51b4ea47e4e923a8f SHA-256: a5fb504fd4528005d9c7179e2e01a4992b70c96aefe83d6187d717de41ffef07
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to a large number of distinct domains, many of which appear to be disposable. This structure is characteristic of a link farm designed to obscure the ultimate destination or to engage in ad-fraud. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or redirecting users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://jujucuisine.com/userfiles/file/48758899646.pdf In PDF document text
    • https://walkandsmile.com/userfiles/file/10355770196.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/12941951219.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/74503504419.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/73657009227.pdfIn PDF document text
    • http://chandravanshi.com/userfiles/file/63274366500.pdfIn PDF document text
    • http://caratow.be/userfiles/file/saruwerifogomirufagu.pdfIn PDF document text
    • http://puginternational.com/ckfinder/userfiles/files/pebigagupajefijus.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/i85evtpeha2h9ki8mo7v9qcie4/17935277584.pdfIn PDF document text
    • http://harekatmemuru.com/images/Media/files/70188268058.pdfIn PDF document text
    • https://btegypt.com/file/26904375287.pdfIn PDF document text
    • http://a-xian-coat.com/uploads/files/202109140003106164.pdfIn PDF document text
    • http://czyxchem.com/upload/files/vemimunimab.pdfIn PDF document text
    • https://bakwanudang.com/contents/files/vebonalew.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/nixuw.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/budoxikisuwadekomazijezo.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/ravevofajagagemefezib.pdfIn PDF document text
    • https://ecotranslation.ca/upload/editor/file/modurusotebinulizulop.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/046263d3a26d7c5b3974780c89c3833e/62271793644.pdfIn PDF document text
    • https://codecs.ro/images/file/benubap.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/22685919138.pdfIn PDF document text
    • http://kleinschaden-expert.com/userfiles/file/nuzogabozejezibebafejutof.pdfIn PDF document text
    • http://as-eng.biz/userfiles/file/nejotozisenalevusidorof.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/zijuratur.pdfIn PDF document text
    • http://kronospan-mofa.hu/editor_up/gagopalit.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/23092985605.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=foh+meaning+slangPDF 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_off0000b178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB178 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c98a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC98A 15336 bytes
SHA-256: fca506e5b8efa3f3e25a5dc202d794da6cf3d1e040182f929979cdc03550f2b6
font_02_sfnt_off0000f073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF073 10332 bytes
SHA-256: bf2cb7f0e7043dcd35543cf1a1e8c6b534d0764e6a1e2622f470bbcb1b5a576a

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