Malicious PDF — malware analysis report

Static analysis result for SHA-256 7265426b32032874…

MALICIOUS

PDF

85.1 KB Created: 2021-09-20 18:37:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6f10f601b0a38c2d38a97e776d16ac2d SHA-1: ccfcbc8197b067a07bd726ee5f00e8374d40994b SHA-256: 7265426b3203287437add2fe37cc68cc64ec9b8a175e8f2a1dbf9e82f51e20ad
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of an advance-fee scam. It contains numerous external links, suggesting an attempt to redirect users to malicious websites for further exploitation. The presence of PDF-specific heuristics and the ML_NYX_PDF_MALICIOUS firing strongly indicate a malicious PDF document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://inwebjor.ru/uplcv?utm_term=android+auto+phone+call+no+sound
    • http://stoewebdesign.no/userfiles/file/gokuvipixo.pdf
    • http://dreamsurgeryen.net/ckupload/files/tavebetor.pdf
    • http://slsnn.ru/content/file/bapomun.pdf
    • http://yakutiaprime.ru/SITE/files/editor/file/66161625657.pdf
    • https://niboparis.com/upload/fckeditor/files/bitudimuda.pdf
    • https://nezrenweb.com/calisma2/files/uploads/gifipo.pdf
    • http://ankaser.com/userfiles/file/dorelejev.pdf
    • http://cathugo-catamarans.de/res/wysiwyg/file/80203696621.pdf
    • http://miwon.com.vn/app/webroot/uploads/files/rofifigororupaxivagedunom.pdf
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/0baa5f09a4ab94dfa3f7a27f4f95d6e1/76657875381.pdf
    • http://muaah.ca/userfiles/files/zafiwamogode.pdf
    • https://holycrosshealthcare.com/userfiles/files/90973594720.pdf
    • https://grupahatak.pl/admin/_fck_files/file/vapifasijalot.pdf
    • http://be-now.pl/userfiles/file/binomakigegugo.pdf
    • http://ya-ke.cn/admin/upload/16819031912.pdf
    • https://bhandarisurgical.com/ckfinder/userfiles/files/gisigawelunexepodobusatus.pdf
    • http://shrlie.com/upload_fck/file/2021-9-17/20210917152823742564.pdf
    • http://balcimimarlik.com/resimler/files/livetimubuvigub.pdf
    • http://xn--o79av69abka850ab6c.com/upload/file/202109051153430483.pdf
    • http://cartonwrappingmachine.com/userfiles/file/vomubopobevog.pdf
    • http://ckud.handysociality.com/upload/files/89321040370.pdf
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/xujidixoburexiruk.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e57b.bin
d1050f2e3073de329940e641272feba1288d9bd4873e2f30bc6e5ee733065b3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE57B 18776 bytes
font_01_sfnt_off00011676.bin
24587c8756685e29794e37e34b3cab187e4c91c62b2ccbd9477b5f884f3891ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11676 10692 bytes
font_02_sfnt_off00012eeb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12EEB 16792 bytes

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