Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfa8979f3293590c…

MALICIOUS

PDF

94.9 KB Created: 2021-09-12 22:48:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7cb6aa09d0111cb94280bcf74011f594 SHA-1: 71a2ba3a1c7d1e1850e77fcecda23e2e7ac50c62 SHA-256: dfa8979f3293590c37c63453843384548f425e4c0212668f1b9c09b264192a37
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains a large number of distinct, disposable URLs, characteristic of a phishing or link farm attack. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://cauthinh.com/luutru/files/durolenikepadulupoxa.pdf
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/vujopagewelefukejurawibi.pdf
    • http://cgpreceptor.com/ckfinder/userfiles/files/levubafijiset.pdf
    • https://preprodpcb.com/userfiles/files/wusof.pdf
    • https://rowadalbyt.com/userfiles/files/sodotadevuwepol.pdf
    • http://arredamentoambienti.it/img/file/tokijejofitenawofi.pdf
    • https://webmenuplus.com/images/file/65176660595.pdf
    • http://factblogs.com/uploaded_files/userfiles/files/57665395999.pdf
    • https://macroedunet.com/userfiles/file/majenujujovonipanexuvow.pdf
    • http://nakloboucku.cz/uploaded/file/lukokunibezazep.pdf
    • http://kibbkw.com/uploads/file/tipujelaxuro.pdf
    • https://rubin2000-distribuitorshop.ro/userfiles/file/73036393535.pdf
    • http://yanarfabrics.com/firma/files/38445023166.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613743123cbd9---28736549507.pdf
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/81512475874.pdf
    • https://net-mex.hu/ckfinder/userfiles/files/24900550769.pdf
    • https://jocafoto.com/fotos/file/31157742645.pdf
    • http://thrifthelp.com/flash/thrifthelp.com/file/motepogugugotekedos.pdf
    • http://elpijisystem.com/file/rimiler.pdf
    • http://mehmetrasimmutlu.com/icerik/file/nevelapa.pdf
    • http://88cpap.com/userfiles/files/35083125511.pdf
    • https://markaoyun.com/calisma2/files/uploads/jixojisosokibigajipa.pdf
    • https://tasteadmin.com/ckfinder/core/connector/php/custom/wysi_uploads/files/dapidaruri.pdf
    • http://utcsp2.rustyramone.com/uploads/files/jukenirura.pdf
    • http://italiangreyhound.pl/img1/userfiles/file/83008687484.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=android+phone+deleted+all+text+messages
    • 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_off00010d98.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D98 16792 bytes
font_01_sfnt_off000125af.bin
f96c3e1047deb8c3c97e92939401dadce33815e45fbf482e6b022a58cd3f3d89		 pdf-font-stream PDF embedded font (sfnt) at offset 0x125AF 10924 bytes
font_02_sfnt_off00013e98.bin
1e7a9d1475293fe6513f683f3c535f9ad8bcd2ca85c732123df8247e40ef0738		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13E98 17984 bytes

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