Malicious PDF — malware analysis report

Static analysis result for SHA-256 26831edfdbd46af4…

MALICIOUS

PDF

82.9 KB Created: 2021-09-10 14:22:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 74808bd94199ed997c523fb4bf95afbf SHA-1: e0377c4738e5160e914634be9248be972fd6fd78 SHA-256: 26831edfdbd46af490174dcea0b1fd9a0db5c594e0306544c98639ccb2b86a00
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, and one heuristic identifies it as a link farm. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://susasoft.com/upload/userfiles/files/pozokewamini.pdf In PDF document text
    • http://tandprotheses.com/ckfinder/userfiles/files/26219627406.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///xosibogezuzumutop.pdfIn PDF document text
    • https://xn--90ah6akb9e.xn--p1ai/f/file/98541983695.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/44262019335.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbf0dc549b---jikemitazune.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613a68500c2c4---jumetiwomizutidezajunal.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/86406816332.pdfIn PDF document text
    • http://autolubitel-irk.ru/userfiles/file/7711105117.pdfIn PDF document text
    • https://tcremich.lu/files/files/63877533382.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/sezevatilasamogetupo.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/9890955148.pdfIn PDF document text
    • http://www.grifin.sk/files/66174663893.pdfIn PDF document text
    • http://mashhadgardi724.ir/basefile/mashhadgardi724/files/zuxoboruvezo.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/83840510248.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/88811755927.pdfIn PDF document text
    • https://h16hr15k-h19hr37urn.com/contents/files/lijurovusalowalivurujop.pdfIn PDF document text
    • https://seikai.jp/free_images/files/botegoziwali.pdfIn PDF document text
    • http://s13cf5ef.alojamientovirtual.com/ropalaboralbarata.com/userfiles/file/tusatafijusereruduxigewir.pdfIn PDF document text
    • http://xibuhuanyu.com/filespath/files/20210903040328.pdfIn PDF document text
    • http://kondicionery-himki.ru/upload_picture/file/35736585352.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/wusuzevizaruwek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=spider+man+ultimate+power+unlimited+money+apkPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c0d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0D3 20528 bytes
SHA-256: 732b9175d08bbc2527e2b83a1cfb68f82b4d6ffe0dc327f70c637f587d90c732
font_01_sfnt_off0000f5fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FA 10852 bytes
SHA-256: 3230047bf79815c4c60840d0cc17e99f417e3d4ece9ef6e92c18a3c1bc17830e
font_02_sfnt_off00010f11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F11 16232 bytes
SHA-256: 01cd0e4798e93fb086042d610f43ddeed7bf091af48aa863f5c4a4f61b651684
font_03_sfnt_off000124ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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