Malicious PDF — malware analysis report

Static analysis result for SHA-256 907620e0d3565e52…

MALICIOUS

PDF

76.4 KB Created: 2021-09-19 04:50:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1a18021812d0f0067cd68fa7ca3f9056 SHA-1: 3c9c3aa7c18e9033262119487535dbf98b254d67 SHA-256: 907620e0d3565e524ca10e27ea3ed6184aed50f4aba340aec305e843f4fd8eab
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests the document is designed as a link farm, directing users to numerous distinct, potentially disposable hosts. While no executable scripts were extracted, the embedded URLs and the nature of the link farm heuristic point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://gsacademy.ge/uploads/files/30883725382.pdf In PDF document text
    • http://ginzaramen.us/uploads/files/ranesid.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/13499411753.pdfIn PDF document text
    • https://trieurodata.ro/images/file/78519851531.pdfIn PDF document text
    • http://phone-server.com/userfiles/file/relibujefowexago.pdfIn PDF document text
    • http://babijie.com/upload_fck/file/2021-9-13/20210913113732452630.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136460a60d26---35377425624.pdfIn PDF document text
    • http://slesnick.net/userfiles/files/sumijurivejaromez.pdfIn PDF document text
    • http://dayou.tw/uploadpic/files/202109190825111505.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/63901593970.pdfIn PDF document text
    • http://radecznica.pl/userfiles/file/38869227126.pdfIn PDF document text
    • https://goldmenu.com/userfiles/file/nuxoguboveni.pdfIn PDF document text
    • http://doudou.tw/userfiles/files/68991614048.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613245d1a2cf2---dozojolenakig.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/wegitixo.pdfIn PDF document text
    • http://vanprodukt.cz/UserFiles/File/nujanapitalobugimiwubutiz.pdfIn PDF document text
    • http://www.yevres.fr/ckfinder/userfiles/files/47651994824.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/gowegavafisesumu.pdfIn PDF document text
    • https://semangkabiji.com/contents/files/11890834032.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/24734659278.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=andaz+apna+apna+full+movie+hd+1080p+watch+onlinePDF 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_off0000c4af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4AF 11292 bytes
SHA-256: 190dce4c22717174aaa64ff5cbde2760525fc9b55ddbf490a5919d25893a01d9
font_01_sfnt_off0000df2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f73d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73D 17424 bytes
SHA-256: 3091b6ce7da505d867855398c5fb0552d5ce370513a6ddcd7449825c2d46e6e7

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