Malicious PDF — malware analysis report

Static analysis result for SHA-256 97f9e2200ee5e874…

MALICIOUS

PDF

70.7 KB Created: 2021-09-25 09:17:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f943045ed31b75fe99f2c1d4908749fa SHA-1: d6ac384c79c21fefb2d15ac288ef0001fa4227ac SHA-256: 97f9e2200ee5e8749ecf5b55f108a1a6798c82e30916439308bd14930aadfa1e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous external URLs, indicating it functions as a link farm designed to redirect users to potentially malicious websites. The presence of embedded URLs and the overall structure suggest an attempt to lure users into clicking through to phishing or malware-hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://chcial.ru/uplcv?utm_term=it+was+always+you+read+online PDF link annotation
    • http://sartor.ru/upload/files/63115725271.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/wewexatu.pdfIn PDF document text
    • http://autolavaggiocraparotta.it/userfiles/files/31110212357.pdfIn PDF document text
    • http://www.beverburcht.nl/upload/files/bovaripekamazujejidilu.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614964690364d---96883403771.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/46162101583.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dovabuworiwibejuse.pdfIn PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210909_97A8A3B1A5A11A7C.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1614ce25232607---10217582085.pdfIn PDF document text
    • https://siltri.com/fck_upload/file/nefesaf.pdfIn PDF document text
    • https://zmiz.hr/userfiles/file/jipajog.pdfIn PDF document text
    • http://belovosushi.ru/files/webibapofipikopabadi.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/c8f2abf45d4a4d63cc1dc2c1825bde7d/50886896987.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/33163073447.pdfIn PDF document text
    • https://actorconseil.com/files/file/wamorifejimub.pdfIn PDF document text
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/32836033704.pdfIn PDF document text
    • http://imdad-egypt.com/userfiles/file/72310703623.pdfIn PDF document text
    • https://kaemsp.org/upload/editor/file/zusilupojaf.pdfIn PDF document text
    • http://suphammamnon.org/uploads/files/74572663055.pdfIn PDF document text
    • http://kcwoman.medsoft.kr/pds/userfiles/files/37462889759.pdfIn PDF document text
    • http://registermycompany.in/admin/userfiles/file/fivazazozijalewadep.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/fuxulufudatoselow.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/fiziminutotu.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/tanuvapurixusabexixa.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_off0000b1b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C8 17240 bytes
SHA-256: c39d087c40de4521cfed6e84a9d19e77be5a6dc19632ac14926a38ce5fcfa264
font_02_sfnt_off0000f556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF556 10492 bytes
SHA-256: a5cd723c447ccbf8a7ec853965acc89200924b0d26b00d5bb440b7c6f5f8188c