Malicious PDF — malware analysis report

Static analysis result for SHA-256 de43dea4a1e1f8eb…

MALICIOUS

PDF

70.1 KB Created: 2021-09-24 10:24:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 55239c90988981fa8088639a6d5117a1 SHA-1: a63a10b90fc6f4dddffe0b1ae51455281c74fb89 SHA-256: de43dea4a1e1f8ebfbb43f9adb8811fc2952b094b3d2461d44fad26604d62015
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. It contains numerous embedded URLs pointing to disposable hosting and link farms, suggesting a phishing or malware distribution scheme. The presence of external URIs and the overall structure strongly indicate an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://philabc.ru/uplcv?utm_term=cedric+diggory+quidditch+team PDF link annotation
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132dc0342c85---widozugadab.pdfIn PDF document text
    • http://stowarzyszeniemalyksiaze.eu/img/upload/files/piloxovifuradufe.pdfIn PDF document text
    • http://vinhthuan.com/upload/files/34456671817.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/foposepotesopaz.pdfIn PDF document text
    • https://drnanemilk.com/tctt/sites/aaa/file/kejimutopilekozolax.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/doligel.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/59567636329.pdfIn PDF document text
    • https://armature.ir/cache/fck_files/file/gomajosokebum.pdfIn PDF document text
    • http://studiovalecchi.it/userfiles/files/sowefilobegonidusojag.pdfIn PDF document text
    • http://ulleungroadtour.com/FileData/ckfinder/files/20210920_BB147E2D6200751C.pdfIn PDF document text
    • http://sperrincaravans.com/images/file/gixavigitadovojeziberiwas.pdfIn PDF document text
    • https://leciv.fr/uploads/FCK_files/file/26232068855.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/87205308161.pdfIn PDF document text
    • https://siksp.megarhizo.com/ci/userfiles/files/sebofawexazeloruranupu.pdfIn PDF document text
    • https://pmms-online.com/assets/file/tewenopowemego.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/fajamosewup.pdfIn PDF document text
    • http://rigassprotes.lv/uploadz/file/sufanitisujokojaponinurip.pdfIn PDF document text
    • http://studioingegneramato.com/userfiles/files/nojozejabufalita.pdfIn PDF document text
    • http://penzion-u-zamku.cz/files/file/mumuwod.pdfIn PDF document text
    • https://westhygiene.hu/editor_up/digipudafosikepizojawil.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/30673563.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161333a9021b6c---52547246499.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/voxibinerazofalusew.pdfIn PDF document text
    • https://isleo.com/i_photos/file/17584947138.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_off0000b411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB411 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC23 15056 bytes
SHA-256: d34516a6916d255677cc1e4f1b9e8f42a8d3b3beb65dbbd69acba945c6f48860
font_02_sfnt_off0000f22d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22D 10888 bytes
SHA-256: 01fbbfd12107d368f15d4c9019433cfd60347d3d39f49636b6498653f631010a

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