Malicious PDF — malware analysis report

Static analysis result for SHA-256 8175bef0c4021679…

MALICIOUS

PDF

92.7 KB Created: 2021-09-19 03:10:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f96cda410e7395fec73e3820126d5b2a SHA-1: c54dbceff642a472008309def62eec78ee161ced SHA-256: 8175bef0c40216794ce7bb2846f1cbb66fad6da38f7ae21a6cd30993f87178df
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external PDFs hosted on disposable domains, indicating a link farm designed to obscure the ultimate malicious destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or a scam, as supported by the 'Password-protected archive lure' heuristic. The presence of many external URIs and the link farm structure point towards a phishing attempt to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://drafthe.ru/uplcv?utm_term=the+comprehensive+enfp+survival+guide+pdf+free PDF link annotation
    • http://galettedesrois.eu/userfiles/file/livejalomid.pdfIn PDF document text
    • http://pscworld.eu/ckfinder/userfiles/files/kevotazene.pdfIn PDF document text
    • https://alcoquimicos.com/ckfinder/userfiles/files/xilotoretosologone.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/damufupulegixamoxi.pdfIn PDF document text
    • http://thuocnam.xyz/images/files/13410080277.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16145bfe533f3e---fedisitujesuxilavumore.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2d63b591a---xojoxeduzomaziwiwe.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/tokekuwuxevibamupumar.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/fowijevuvogezedofifanomis.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/lulurovepexigozofose.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/23510220211.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/jawolafibev.pdfIn PDF document text
    • https://bdata.vn/upload/files/97819560531.pdfIn PDF document text
    • https://bocion.com/ckfinder/userfiles/files/61004730710.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/podulokezuna.pdfIn PDF document text
    • https://letstravelforacause.com/miet/assets/files/69039517777.pdfIn PDF document text
    • https://www.alugutader.fr/ckfinder/userfiles/files/24725574499.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/92070148683.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/88595456112.pdfIn PDF document text
    • http://e-restauracion.com/app/webroot/files/uploads/files/15370160028.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/zegevoluxefuxafimi.pdfIn PDF document text
    • http://nguyenxuanhuong.com/upload/files/wurure.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/wedejegasefuvid.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/jesedizaxekoluponasaf.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210908154425.pdfIn PDF document text
    • https://www.la-melodie-des-saveurs.fr/ckfinder/userfiles/files/gesibesifasilobitivalo.pdfIn PDF document text
    • 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_off00010151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10151 18656 bytes
SHA-256: 85dc13b09d6564543f8257c767d416d595a7b014ce0abbcc5caf9a2c3ca69c3a
font_01_sfnt_off000132d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132D2 11100 bytes
SHA-256: 19fba8396aa023d449c76e2e982c4f684be74823f0f7ad989b94a92949f79f67
font_02_sfnt_off00014c4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1