Malicious PDF — malware analysis report

Static analysis result for SHA-256 658e4642dcad3e2f…

MALICIOUS

PDF

85.2 KB Created: 2021-09-09 19:05:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fedee02b075943f85f3f2022c00e2d59 SHA-1: 8f448cd3d10c4a1cb87c4ee9655ff9cc925a79d7 SHA-256: 658e4642dcad3e2f7a88608cc6b4edc532983ff90fde9cb2acce6ba566f90ad3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://catamma.ru/uplcv?utm_term=my+talking+tom+unlimited+coins+and+diamonds+mod+apk PDF link annotation
    • http://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/71120076972.pdfIn PDF document text
    • http://aaas.handyfriendship.com/upload/files/sujorimabukew.pdfIn PDF document text
    • http://sakesushilakehavasu.com/uploads/files/rubinux.pdfIn PDF document text
    • http://oembag.com/uploads/files/202109021203245862.pdfIn PDF document text
    • http://origo.ws/userfiles/file/savaduguzafawolilekutefi.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/guzepifit.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/pujixuvagekefapupefuke.pdfIn PDF document text
    • https://mimpishio1bet.net/contents/files/79545667288.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/zaximexujeb.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/bagenerudor.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346a5a632fc---54051667928.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/92171493037.pdfIn PDF document text
    • https://equalitas.es/userfiles/file/marebul.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/76664936893.pdfIn PDF document text
    • http://innotack.com/userfiles/file/71784011272.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/wufuxopifetid.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/85093134824.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/2645942377.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/94921844675.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/11597902081.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/popetiwe.pdfIn PDF document text
    • https://funbugs.ie/files/file/dulibaporerexes.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/satotaxidodikuvefoxajur.pdfIn PDF document text
    • https://perkunasstudio.com/uploads/files/202109010121459601.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_off0000e78a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE78A 11056 bytes
SHA-256: 8424a1aa32e80240e039e037f8a9d64959b1cd913b04726f9c5148b86538ef4e
font_01_sfnt_off00010112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10112 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11924 17956 bytes
SHA-256: 824971087dff6763d6a5702f8ad4c4ca04bc66124f7ec5c83be8c439d72d2929

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