Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0c7c007806fe3ab…

MALICIOUS

PDF

73.5 KB Created: 2021-09-12 15:29:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 80b0724c9fad5319a339bd82118ca641 SHA-1: 961631ec7c762e2109c7b889dbd371d2e1be4046 SHA-256: b0c7c007806fe3aba5eb52eab9f12d5af876bb9b90ad2a731bdbf4b731769f1f
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple external URIs, including one that masquerades as a download link for 'sololearn pro apk'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://allytemp.ru/uplcv?utm_term=download+sololearn+pro+apk PDF link annotation
    • https://francois-daulte.com/ckfinder/userfiles/files/pewulomasinebit.pdfIn PDF document text
    • http://mcutech.net/files/74107827842.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/darovinituduvufuri.pdfIn PDF document text
    • https://himarco.ir/basefile/himarcoir/files/22477321372.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/pevuzofexoginubawake.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/23659492280.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/57143068514.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/161370e24f32d9---93628454599.pdfIn PDF document text
    • http://185.33.116.142/~bbyacht01/upload/files/39207219618.pdfPDF link annotation
    • http://motolargo.pl/userfiles/file/kinosilajazutowibef.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/sekopupibugetosovabukej.pdfIn PDF document text
    • http://thesei.com/In PDF document text
    • http://igabana.com/upfolder/e/files/20210907070647.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/13550533643.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210904015734.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021090421142780554.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/gaxibovepog.pdfIn PDF document text
    • https://ilonew.tasksplan.com/userfiles/files/9318479223.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/65140114122.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/mifowime.pdfIn PDF document text
    • http://jca-t.com/fck_image/file/mujaxilafubibivabub.pdfIn PDF document text
    • http://wenxuezj.com/images/File/84601794100.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_off0000bb24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB24 17800 bytes
SHA-256: 77dfe63c02a16063fe976c8d7894f59df03345d3eb34f0a569f72c63af1dd514
font_01_sfnt_off0000e917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE917 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001012e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012E 10376 bytes
SHA-256: 4509b5ee677c586c013662158155f413878aa3e1fd94074f53bdf0827f466189

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