Malicious PDF — malware analysis report

Static analysis result for SHA-256 a92ae099d80b6188…

MALICIOUS

PDF

82.3 KB Created: 2021-09-11 19:57:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 060fb933811895309cb2f8a4020b4725 SHA-1: 79fbedcb651b28c856618c68d2a5c407a0ca6887 SHA-256: a92ae099d80b618845ea111fb983d3ba16eaaf4c66e073416cbb8a82d3b3c322
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external domains, suggesting a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this by indicating a link farm on disposable hosting, commonly used for malicious redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://coretry.ru/uplcv?utm_term=android+1+asphalt+xtreme PDF link annotation
    • http://spadhotel.com/basefile/spadhotelcom/files/86687209864.pdfIn PDF document text
    • https://domilot.com/uploader/files/wakogupusupadaduvasuruked.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/38617953236.pdfIn PDF document text
    • http://katela.net/userData/board/file/wuzekuwutorowejalovemepi.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/59485732272.pdfIn PDF document text
    • https://a-guskov.ru/uploads/files/83905091524.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/bamebimowajopi.pdfIn PDF document text
    • https://red-adlay.com/upload/files/jinovejag.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/40004565829.pdfIn PDF document text
    • https://phm.vn/upload/files/jaxipasulegogijalizegome.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/tupujukelono.pdfIn PDF document text
    • https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/jinuletaxalofefad.pdfIn PDF document text
    • https://pokereshop.cz/data/file/21197572861.pdfIn PDF document text
    • http://cobmedia.hu/include/lazilepikok.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/71964413355.pdfIn PDF document text
    • https://learningsolution.ca/userfiles/files/lexazelajulenobexana.pdfIn PDF document text
    • https://bakwanudang.com/contents/files/tawanajoluxusodanabi.pdfIn PDF document text
    • https://cosmopolitanhotelbg.com/uploads/wysiwyg/files/90704158108.pdfIn PDF document text
    • http://uteambio.com/upload/files/valomikonimanirawiw.pdfIn PDF document text
    • http://studiomanzetti.it/userfiles/files/kamumetikavuremafukesoxix.pdfIn PDF document text
    • https://rubenferro.com/userfiles/file/89328781751.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/53877977786.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/wovofik.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_off0000dc0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0A 17928 bytes
SHA-256: 72c02f22a15f596c83b76f4ef9793f32bceb6a3f3d4ab4b6b1afe34e8b75c8a1
font_01_sfnt_off00010aa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA9 10792 bytes
SHA-256: 68264163fa30114d43f42e18e990983e8031180867a614d083dfed3f0d256e3c
font_02_sfnt_off00012362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12362 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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