Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c5c520ba394b14a…

MALICIOUS

PDF

69.2 KB Created: 2021-09-26 05:25:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bcfb3a428f8fecfd27a50eeb7c5b1443 SHA-1: c33a9952e00b8c08faf767862b7bb7e8f244e378 SHA-256: 9c5c520ba394b14aeadcceb774d22a50cf121e7abdb34fff260f6b66ea51190b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs pointing to PDFs hosted on various domains, with one heuristic specifically identifying a 'link farm on disposable hosting'. While no scripts were extracted, the presence of multiple external links and the nature of the heuristics suggest a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://rajaunited.com/contents/files/miserikusojafisaleju.pdf In PDF document text
    • https://sd-olimp.hr/files/dirilevaxovageso.pdfIn PDF document text
    • https://maritime-models.com/userfiles/file/87944944879.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/dogidinosotaz.pdfIn PDF document text
    • http://twapp.freshkon.com/upload/files/8807118232.pdfIn PDF document text
    • https://abcelectricalonlineshop.brilliantwebtech.com/userfiles/files/waripijutosinidote.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/d751f692b4ba2845f3d210150a52dd91/sinamibovavaxin.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/bujujegolaranej.pdfIn PDF document text
    • https://kildevangen.dk/files/gositafe.pdfIn PDF document text
    • https://x-leather.com/radsportfiles/file/27245387769.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/jixexakexizaniwore.pdfIn PDF document text
    • http://synowka.pl/galeria/file/62887732090.pdfIn PDF document text
    • http://thietbianninh188.com/uploads/files/ritawajegosaxase.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/winiko.pdfIn PDF document text
    • http://studioingegneramato.com/userfiles/files/xafogogeveligifoduvo.pdfIn PDF document text
    • https://officialbacknumber.org/editor_up/fugeveloruvewinepizo.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/78225322981.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210922025247.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/2k23ope0jn6o2laoftei5ps1s1/93042920868.pdfIn PDF document text
    • http://www.primariasantana.ro/uploads/file/18542954958.pdfIn PDF document text
    • http://studiotecnicoligioni.com/userfiles/files/51777683437.pdfIn PDF document text
    • http://7serve.org/userfiles/file/20210917125505.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=superlative+adjectives+exercises+pdfPDF 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_off0000ad61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD61 15892 bytes
SHA-256: 5e88c3c03e8527d45ead287bdcf468059ddceb1e3b28a6ccf735928eb6316e24
font_01_sfnt_off0000d5e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E2 10864 bytes
SHA-256: 54106831fa1ba178b599f6a26074576bcb46a8733e0c3f35db697e894e768475
font_02_sfnt_off0000ef1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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