Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebc98e78c884b1d8…

MALICIOUS

PDF

82.0 KB Created: 2021-09-12 20:54:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: afbc9099b939514f4d7a4da61f3396a0 SHA-1: 9827f5869c1ff3f253b9a88d2091184ec44ed270 SHA-256: ebc98e78c884b1d81117552545bf3affebdd4d776e737510948f69c123271ffc
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 heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous embedded URLs suggest the document is designed to redirect users to potentially harmful external sites. While no scripts were explicitly extracted, the nature of the embedded URLs and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://lazdynumokykla.lt/userfiles/file/99096523699.pdf In PDF document text
    • http://etkenkalip.com/files/mijeton.pdfIn PDF document text
    • http://xn--4k0b43gkwo4gn.com/upload/editor/file/90296106843.pdfIn PDF document text
    • https://bk.knu.ac.kr/ckfinder/userfiles/files/giranikikox.pdfIn PDF document text
    • http://www.musicboxpiano.com/contentfiles/14954631939.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/40123583600.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1bc0c6320---73490465090.pdfIn PDF document text
    • http://hhsmelt.com/upload/files/82618520280.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16130823a47753---13162624.pdfIn PDF document text
    • http://tycoonmedical.com/userfiles/file/3719824315.pdfIn PDF document text
    • http://reginahajo.hu/_user/file/poxoxusotafineb.pdfIn PDF document text
    • http://siblom.ru/files/upload/file/12131308260.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/misevanexa.pdfIn PDF document text
    • http://mobilenmr.com/files/files/nobejurixemubugajawo.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/depopufimibufotim.pdfIn PDF document text
    • https://drnanemilk.com/tctt/sites/aaa/file/tijugitagonomibor.pdfIn PDF document text
    • https://mlbcsimleague.com/ckfinder/userfiles/files/mikekela.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/notubivejewudogu.pdfIn PDF document text
    • https://playindiano1.in/ckfinder/userfiles/files/siwofop.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/barodokusoxuniwex.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/63060126556.pdfIn PDF document text
    • http://studiomarcheluzzo.it/userfiles/files/bavusinozelepilu.pdfIn PDF document text
    • https://ashasuchikala.com/ckfinder/userfiles/files/79371859602.pdfIn PDF document text
    • http://avvolodin.ru/upload/file/miruk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=vidmate+best+video+downloader+appPDF 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_off0000dab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C8 10816 bytes
SHA-256: be10660dafbc1ad81ef891d8e544bb2a3a73774e17731ebe6861edcc23d7251c
font_02_sfnt_off00010b84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B84 18152 bytes
SHA-256: 13b64da0155815f522c8ac116da5eab4c55374296d0210d60c22dd1a20bc8924