Malicious PDF — malware analysis report

Static analysis result for SHA-256 03161ec98f4e0d80…

MALICIOUS

PDF

85.5 KB Created: 2021-09-09 21:27:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4008b9dd10d133b74388c46e04ad0f13 SHA-1: 9a7f71bd9c9bd6a239fd8cdea2801b240bf6bde9 SHA-256: 03161ec98f4e0d80e021aa858d0b790803a34a84070300cb71d93620f81c31ae
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is a phishing lure, including MFA/one-time-code harvesting. It embeds numerous external URIs, with one prominent URL pointing to a potential phishing site. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into revealing credentials or executing further malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://inwebjor.ru/uplcv?utm_term=apple+music+coming+to+android PDF link annotation
    • http://nacyc.jp/Upload/file/gekiwoliwokivekar.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/37744594295.pdfIn PDF document text
    • http://elma1.ru/!upload/files/voduvafod.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/vosadejubupilorawima.pdfIn PDF document text
    • http://squash-fitness.cz/userfiles/file/32359590140.pdfIn PDF document text
    • https://emenu.hu/editor_up/53211692157.pdfIn PDF document text
    • http://balcimimarlik.com/resimler/files/93531662247.pdfIn PDF document text
    • https://agrocare.ro/ckfinder/userfiles/files/82493853407.pdfIn PDF document text
    • https://okinawa4d.com/contents/files/dazeg.pdfIn PDF document text
    • http://ch-bovi.com/upload/files/rizolon.pdfIn PDF document text
    • http://ptichile.cl/userfiles/file/93852300336.pdfIn PDF document text
    • http://iwayman.com/uploadfiles/file/2109022350533335018pds49.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/xiripep.pdfIn PDF document text
    • http://agroanaliz.by/upload/editor/files/19899894015.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/dowatilemuwa.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16133e915ba33e---jivulewunase.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/raxokijavixusu.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/sipobem.pdfIn PDF document text
    • http://kiapelhrimov.cz/UserFiles/File/42936104944.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/jizevifetipamozokez.pdfIn PDF document text
    • http://wijnhuis-vaessen.nl/site/data/ws/files/83884441278.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/42142940116.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/30116031828.pdfIn PDF document text
    • http://xn--42-jlclgg6a3e.xn--p1ai/userfiles/file/55153234384.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_off0000e67b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE67B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8D 18868 bytes
SHA-256: 93eb17136f83378dcc7df10e0d1b13ddad7a96864e843ac044bbd81e1b7ab1bf
font_02_sfnt_off00012f7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F7F 10940 bytes
SHA-256: a76e788b3fddbdac688cfdb0b8d4db58cfca6e1db8bf85f211e79ebd4201d59a

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