Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e25903003ffa0f8…

MALICIOUS

PDF

79.5 KB Created: 2021-09-16 04:52:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 98dfd148915329d5de3ff0903cc2a8ae SHA-1: 454a9137731eeb22ddfa2cb540aef2e858e80317 SHA-256: 8e25903003ffa0f8333ad55153558ce5b46fee98390c102755b6d56e6e20a60e
126 Risk Score

Malware Insights

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

The PDF document was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many pointing to disposable domains and utilizing UTM parameters, strongly suggests a phishing or malware distribution campaign. The document body is heavily obfuscated, preventing a clear understanding of its direct content, but the overall structure and URL analysis point to a link-farming or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://wastran.ru/uplcv?utm_term=ps+2+rom PDF link annotation
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/fazovixixidotidaruvu.pdfIn PDF document text
    • https://fasleh.net/Files/files/bowurosopadukinuve.pdfIn PDF document text
    • https://austarpharma.com/upload/files/70681290376.pdfIn PDF document text
    • http://dichvu12h.net/userfiles/file/najuj.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d37f756dea---7592600995.pdfIn PDF document text
    • http://ecole-belair.com/ecole/file/zupozonafafef.pdfIn PDF document text
    • http://qdsenfeng.com/data/files/50925388620.pdfIn PDF document text
    • http://tonioloclaudio.it/userfiles/files/dotesirorure.pdfIn PDF document text
    • http://sp2wronki.pl/fotki/fotki/file/12506022480.pdfIn PDF document text
    • https://alternatifhirdavat.com/upload/ckfinder/files/86477075701.pdfIn PDF document text
    • http://vigova.vn/Images_upload/files/kimuratoxupixabosomuginus.pdfIn PDF document text
    • http://yhbinternational.com/userfiles/file/nupupidusog.pdfIn PDF document text
    • http://eqletstalk.com/uploads/files/202109141136594358.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/97308347305.pdfIn PDF document text
    • http://gr-chem.com/upload/files/wuwadaxovab.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/gobuzokunusutusonuwibepem.pdfIn PDF document text
    • https://lenaoyunlar.net/calisma2/files/uploads/soribumexuj.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/p3mb29ruge7d4co4odbuqso7lh/pomudajuxi.pdfIn PDF document text
    • https://mrdak.cc/uploadfile/files/20260992144.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210916090625.pdfIn PDF document text
    • http://rassadaspb.com/new/files/file/gavalozufomavukujerudob.pdfIn PDF document text
    • https://lrsinc.co/userfiles/file/64566429727.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_off0000d4fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FC 17940 bytes
SHA-256: 072f82f7da75f02291c367ff3948bc9d9224ec8506744b04532dcae6fcdbb6b7
font_01_sfnt_off00010377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10377 9756 bytes
SHA-256: 9fe06926b2ea36f92c46073f59e67716ab105486c3b27be97e49530123278daf
font_02_sfnt_off000118d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1