Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b4b7032306b882c…

MALICIOUS

PDF

94.2 KB Created: 2021-09-19 00:47:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: d43d1e394175c25fdb5a6d981eeedce5 SHA-1: 5869cd1541c7f14ce8cfab2ec1880a468a63afaa SHA-256: 6b4b7032306b882c3de5edd6259ef9fa575d6bdb6ca545cd45f89e4de43d320c
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to domains flagged as disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=demon+slayer+mugen+train+sub+full PDF link annotation
    • https://silverbirdmarketing.com/pages/images/file/nuzeluzosemulomorari.pdfIn PDF document text
    • http://king-ber.com/UploadFiles/file/20210906025739501.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/nasanufiwori.pdfIn PDF document text
    • http://tischtennis-kiel.de/images/file/88101142176.pdfIn PDF document text
    • http://quanhoangtsi.com/upload/quangtri/files/49964593712.pdfIn PDF document text
    • http://tg-focus.ru/userfiles/files/82248714018.pdfIn PDF document text
    • http://hadt.vn/upload/files/govolejewolebakidagapegax.pdfIn PDF document text
    • http://xn--989ap7r0xbd5x.com/upload/fckeditor/file/3846466594.pdfIn PDF document text
    • http://lulanjina.net/upload/files/kiner.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/molavivezadisetixinepevud.pdfIn PDF document text
    • https://thepainter.asia/upload/files/mazamukolano.pdfIn PDF document text
    • https://hiperaktivite.info/userfiles/files/19556378305.pdfIn PDF document text
    • https://gogift-it.com/userfiles/files/6441084079.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/72292416578.pdfIn PDF document text
    • http://studiomedicoveterinariobellucci.eu/userfiles/files/sowurivid.pdfIn PDF document text
    • http://insightonafrica.in/userfiles/file/73971083238.pdfIn PDF document text
    • https://cakkue.com/contents/files/rediwubitat.pdfIn PDF document text
    • http://hotel-ambassador-nice.com/upload/files/22373180313.pdfIn PDF document text
    • https://interior-mark.com/ckfinder/userfiles/files/84947305142.pdfIn PDF document text
    • http://xecuoihuyhoang.com/uploads/userfiles/file/23251454286.pdfIn PDF document text
    • https://hamayeshniroo.com/shop/file/pedifudivipegadoroseja.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/67767089493.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_off0001078e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078E 10912 bytes
SHA-256: 53af0de954f5269a877b3da903df8b4c4e05b403233690d688afc98a664e3a96
font_01_sfnt_off000120d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D7 19080 bytes
SHA-256: 625877d682fb6c53f036698c0c17853181e5c715691fcc71b0928ffae562f5f4
font_02_sfnt_off0001532f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1532F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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