Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b48c848c967f1b1…

MALICIOUS

PDF

77.7 KB Created: 2021-09-11 00:16:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: af9f48f2889e707dd2d4e935c5c162d1 SHA-1: 6850185195e2ab4532885dfb707d932b2b032da9 SHA-256: 0b48c848c967f1b1e8820f2b182efc03dab5c139b146c992088f80283eb87ed1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to potentially disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded content, while heavily obfuscated, are consistent with malware delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://designpavelzapletal.cz/files/file/nopokeboxozup.pdf In PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc83a2c397---54073746340.pdfIn PDF document text
    • http://wonikqnc.com/upload/editor/file/1631011700.pdfIn PDF document text
    • https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/88619184817.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/19596259314.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/6082524079.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/51294377916.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/wuzebuxekoxuta.pdfIn PDF document text
    • https://kawanmto.net/contents/files/99068857455.pdfIn PDF document text
    • https://agriturismoilcolle.org/userfiles/file/35820789839.pdfIn PDF document text
    • https://easternresources.net/ckfinder/userfiles/files/98030659042.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/xumazudimubumupomevejofe.pdfIn PDF document text
    • https://harmony.im/userfiles/file/18653680377.pdfIn PDF document text
    • http://iphysiology.ru/upload/jotizovolasikuxulix.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/lemekeliveman.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/lilosojosowimedififeleni.pdfIn PDF document text
    • http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/vevusezuwub.pdfIn PDF document text
    • http://trufeel.com/ckeditor/ckfinder/uploadfile/files/12287774221.pdfIn PDF document text
    • http://tuzoltosagmihald.hu/userfiles/file/88046803468.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/dukoluwomikokufa.pdfIn PDF document text
    • http://steffis-strassladen.de/userfiles/file/31018511711.pdfIn PDF document text
    • http://tonioloclaudio.it/userfiles/files/vijeg.pdfIn PDF document text
    • http://kingkady.cn/uploadfile/files/kojofibiwabirexoriwasoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=naruto+ninja+councilPDF link annotation
    • 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_off0000c80a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC80A 19244 bytes
SHA-256: c8865eb5c9c2c2c129a8f950bb6a62a7313e910d024a86301a599aedba277acc
font_01_sfnt_off0000faf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF9 10128 bytes
SHA-256: 8f43a447381c99c56dcae3e5e377cb33ed614525b101749699401716713a019d
font_02_sfnt_off000111a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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