Malicious PDF — malware analysis report

Static analysis result for SHA-256 6403b5b959fd5577…

MALICIOUS

PDF

70.6 KB Created: 2021-09-28 04:52:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b4add8376096d5997af08aefdf863294 SHA-1: 653cb11ccb9346d03c05ec509c2cbbfb76917528 SHA-256: 6403b5b959fd5577d4d673d914a692f1c91930540e94f9dd29d3888ec0e4365b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with a high heuristic indicating it functions as a link farm on disposable hosting. ClamAV and ML classifiers also flagged it as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the PDF structure and link farm behavior suggest an intent to redirect users to malicious sites, likely for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://phm.vn/upload/files/nipowebiwujefisa.pdf In PDF document text
    • https://gloriamus.org/Uploads/userfiles/files/moxuz.pdfIn PDF document text
    • http://ashole.hu/UserFiles/File/977523142.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/vetoxunexowej.pdfIn PDF document text
    • http://npcbalkan.net/ckeditor/ckfinder/userfiles/files/29501142706.pdfIn PDF document text
    • http://nbc.ua/design/pic/file/luvafebukev.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/54797658715.pdfIn PDF document text
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/14048030699.pdfIn PDF document text
    • http://varadimasszazs.hu/uploads/files/talazilemi.pdfIn PDF document text
    • http://modulobase.com/userfiles/file/beninirazo.pdfIn PDF document text
    • http://kantipursecurity.com/userfiles/file/sagoxegowinusudikisuvi.pdfIn PDF document text
    • http://sipzip.com/userfiles/file/topifufelagadomewe.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/regeboni.pdfIn PDF document text
    • https://strongpointmarketing.net/userfiles/file/54800493583.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/69988643849.pdfIn PDF document text
    • https://aayams.com/userfiles/file/jozurivinuko.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/46172830369.pdfIn PDF document text
    • http://ain.proximeo.com/ckfinder/userfiles/files/wegisapugexanor.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/xosutabopel.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/45807622352.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210924181037_5h29pi.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/36318769218.pdfIn PDF document text
    • https://soenen-pneus.com/upload/file/nigelanovovubizirose.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=hd+themes+download+for+android+mobilePDF 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_off0000aee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6FA 10836 bytes
SHA-256: eb6814421f2bb19ae1165fa3c33893511d999ad6faa53d68f393ed74a0e2747f
font_02_sfnt_off0000dfc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC3 17336 bytes
SHA-256: 518d000cc1e7f33ff27a940951b80aca142f32caabfb8dd447da8de7ee8ef23a

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