Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce9c03a8ded3ad47…

MALICIOUS

PDF

78.8 KB Created: 2021-09-16 18:46:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4d18ce72a34a230d9768bd645e749a9c SHA-1: 2bdbc72415322aaf857c8697f5696b9fafdf803a SHA-256: ce9c03a8ded3ad47a6f9cd24ca6a08d0eee1eb46e314d20e186e2b36435a6ebb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malware distribution attempt. The presence of external URIs and the 'link farm' heuristic strongly suggest the document's purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/uplcv?utm_term=why+some+apps+are+not+downloading+from+play+store PDF link annotation
    • https://kenhquangcao.vn/uploads/files/97215329276.pdfIn PDF document text
    • http://mezon.jp/userfiles/file/34319598528.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/bebokaridew.pdfIn PDF document text
    • http://henskeschildersbedrijf.nl/upload/2450980592.pdfIn PDF document text
    • http://specialcats.nl/media/files/34134209469.pdfIn PDF document text
    • http://law885995.com/upload/fckimages/file/65447970315.pdfIn PDF document text
    • https://alemarferries.alemarsnp.gr/ckfinder/userfiles/files/44039113322.pdfIn PDF document text
    • http://studioassociatoemc.com/userfiles/files/96210234223.pdfIn PDF document text
    • https://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/93938996591.pdfIn PDF document text
    • https://learn-atdi.com/uploads/files/55625569737.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/86096378999.pdfIn PDF document text
    • http://friulanamarmi.it/images/file/64846240259.pdfIn PDF document text
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/safusitaxalemigo.pdfIn PDF document text
    • https://maytinhdalat.vn/images/uploads/files/pedefazifo.pdfIn PDF document text
    • https://gcr.goldcrownresort.com/magazine_files/files/84942216588.pdfIn PDF document text
    • http://nfc.soo.jp/file/femedasedujufixi.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/junamonaxime.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/14169443520.pdfIn PDF document text
    • https://inprovitecuador.com/ckfinder/userfiles/files/tuwokosukov.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/161420eda2bc89---kubazutawunovunoxibot.pdfIn PDF document text
    • http://sozopolihills.com/userfiles/file/78138265534.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_off0000ce57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE57 17584 bytes
SHA-256: e1de92353528ae7bedd2e4ea44b4950c2c3a01204a2b55da9d198866ff6d81b2
font_01_sfnt_off0000fbad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C4 11140 bytes
SHA-256: ffaeb9e833ff357acf8fc6599c58ffcf52ea41dac6f2391faaf52fc5afdc62d1

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