Malicious PDF — malware analysis report

Static analysis result for SHA-256 6324f2e7954d2506…

MALICIOUS

PDF

75.5 KB Created: 2021-09-21 09:48:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5e5eed5279883f620cbf39d6863473f8 SHA-1: 34dc155a4672adc26c2d5984ad54a835fc3074e8 SHA-256: 6324f2e7954d250687076f5b1a007fce9167a53941a6d127b15be2a23a03d392
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, many pointing to disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded links are consistent with attempts to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://herium.net/FileData/ckfinder/files/20210917_77D16DCEA00D09E7.pdf In PDF document text
    • http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/11067754701.pdfIn PDF document text
    • https://27061010.com/uploads/files/202109191205221134.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/lajiburagiwejilojopegaz.pdfIn PDF document text
    • http://vanlysecurity.vn/vanly/album/files/96763705828.pdfIn PDF document text
    • http://panova-art.com/files/file/23912093940.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/sagipitoxax.pdfIn PDF document text
    • https://ssvacancy.com/ckfinder/userfiles/files/mibusiboxojerika.pdfIn PDF document text
    • https://lotusmarinevn.com/upload/files/20294766006.pdfIn PDF document text
    • http://willowslakerhea.org/userimages/36527785522.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109020919468600.pdfIn PDF document text
    • https://turbooto.vn/upload/files/1053222537.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614608f034984---famezived.pdfIn PDF document text
    • https://bkairconditioner.cloud4demo.com/uploads/files/33271690902.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab99262e6b---19499629628.pdfIn PDF document text
    • http://familie-schiecke.de/images/file/jasowakowokeliwunuwipimi.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/nafumino.pdfIn PDF document text
    • http://divodizain.ru/ckfinder/userfiles/files/banoxiwezuposuvebaz.pdfIn PDF document text
    • http://xn----7sbbgprpk7biiq.xn--p1ai/admin/ckfinder/userfiles/files/nasivijenewagipuxedemuv.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/29779069319.pdfIn PDF document text
    • http://onlinemidias.com/ckfinder/userfiles/files/vifutupobitiporunazep.pdfIn PDF document text
    • https://sergiomauri.com/images/file/pevejojuna.pdfIn PDF document text
    • http://boek.se/bilder_umeny/File/xexil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=fast+and+furious+takedown+downloadPDF 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_off0000c172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC172 10600 bytes
SHA-256: 156e0176a6a014b079fd8395c7aa93673c0bacff5a0cea07239a90444631a0fb
font_01_sfnt_off0000d9d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D0 17816 bytes
SHA-256: eaeac217b35b17c181c575916c4122b7044f040b416ca421610c529838e0b7a9
font_02_sfnt_off0001082d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1082D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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