Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc2b4cb975526f82…

MALICIOUS

PDF

77.3 KB Created: 2021-09-09 11:50:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 316ccddbccce8e1e8992e0a4a2638759 SHA-1: 259afe8c89665a34344ab3fa0db16e264a4cb357 SHA-256: dc2b4cb975526f820b84ed74b875b2872c0afb3445632067eb30231758129f68
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that redirect to various websites, many of which are hosted on disposable domains and appear to be part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to direct users to potentially harmful content. ClamAV detection further confirms the malicious nature of the file, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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=talking+tom+gold+run+apk+download PDF link annotation
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161311df1dcb27---xoloxikijelilogonogeje.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/36037675271.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/50751776248.pdfIn PDF document text
    • http://mzch.pl/userfiles/file/kulaxilaborovanunan.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/xemejunewev.pdfIn PDF document text
    • http://refinerlink.com/userfiles/file/23541708787.pdfIn PDF document text
    • https://betamachinery.sa/other_files/File/48863115708.pdfIn PDF document text
    • http://tomaszskiba.com/userfiles/file/poponomofowipifijota.pdfIn PDF document text
    • http://dnt-mayak.ru/content/File/vulavoniberanavozuxeko.pdfIn PDF document text
    • http://vrtaspol.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/78797251802.pdfIn PDF document text
    • http://trunglam.vn/uploads/userfiles/file/6529792125.pdfIn PDF document text
    • https://fullprotec.com/ckfinder/userfiles/files/84017960580.pdfIn PDF document text
    • http://wonsakai.com/uploads/files/92195822937.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/25206159546.pdfIn PDF document text
    • https://bodzlomu.com/userfiles/file/353335504.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/68407518300.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/55652143458.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/kijamateroviteb.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/50866814442.pdfIn PDF document text
    • http://ylpqzl.com/ckfinder/userfiles/files/97009062354.pdfIn PDF document text
    • http://telecycling.info/files/file/76372500094.pdfIn PDF document text
    • https://campermagazine.tv/public/file/xewakiba.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138960b1607e---73251545651.pdfIn PDF document text
    • https://studioconcept-stand.com/fck_userfiles/file/legagimugejenuj.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_off0000c91e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC91E 17620 bytes
SHA-256: 50856db5e863cbb32c48400a3fc8826e4d13e386a03bcd15249484a56c71855f
font_01_sfnt_off0000f6ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F16 10676 bytes
SHA-256: 09995c71d1588f6663100f98ad18d81632b3f1c05c5199163744aa1647918e82

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