Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ea821ee9784d1eb…

MALICIOUS

PDF

72.7 KB Created: 2021-09-26 12:08:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5eab4dd041970d0b6583f1813edafd4e SHA-1: 435d8b22f96fa8ae2693cdd39e0568e663a1481b SHA-256: 0ea821ee9784d1ebfd37befd64a21c2ed385a02a450096400213f2b6ae5e75e9
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 part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://krisoc.ru/uplcv?utm_term=music+folder+player+free PDF link annotation
    • https://zlatartopalovic.rs/files/79781173734.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161488b367eeb8---belorujapasi.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/61104254039.pdfIn PDF document text
    • https://shopinhome.com/ci/userfiles/files/66325305778.pdfIn PDF document text
    • http://sowiik.pl/userfiles/file/35937673441.pdfIn PDF document text
    • http://atrsara.ir/resource/files/punaverazalaxidutarol.pdfIn PDF document text
    • http://raegcafe.com/uploads/files/39200765645.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/68547497679.pdfIn PDF document text
    • http://xn--9i1b14lzokxjcrti5um.com/upload/fckeditor/file/xejeke.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210922232707189.pdfIn PDF document text
    • https://latrinquette.com/upload/editor/file/pisakevero.pdfIn PDF document text
    • http://quiltingacademy.info/fckeditor/userfiles/file/kowatabuxopapojaseperirek.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/zasimajoja.pdfIn PDF document text
    • http://webmba.fr/client/logo/file/dewekaxerererotesepifoban.pdfIn PDF document text
    • http://th-hl.com///upload/files/xubosonopufatunafidemap.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/31049550007.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/41811829650.pdfIn PDF document text
    • http://dworbieland.pl/userfiles/file/tixidawodidurejazigi.pdfIn PDF document text
    • http://nhasachnguyenvancu.com/Images_upload/files/ximapejozasivoxam.pdfIn PDF document text
    • http://textstricker.de/benutzerdateien/32057897184.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/pageweneziz.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/88273577141.pdfIn PDF document text
    • http://varadimasszazs.hu/uploads/files/14193941284.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/95010957517.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b09e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB09E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8B0 16976 bytes
SHA-256: 0c09bf348fc41cc93f0bf76720f3dfd7118ac20b85670a327904317f7925a089
font_02_sfnt_off0000f36c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36C 10620 bytes
SHA-256: 58497f2f6077b218038c488c0650979930815dd38f71201c8e0687da51f4636a
font_03_sfnt_off00010bcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCB 2044 bytes
SHA-256: 9ff0be215eda4510cc1b192ab1b3482226358aa5dcf0ff2a485682e2549b9830

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