Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d2d415af3937c8c…

MALICIOUS

PDF

85.8 KB Created: 2021-09-19 12:16:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 7dcd1a97cdde0c5314b8ca37e638b29a SHA-1: 9809e2ef483966ea5ba7f77b7e384727121b30cb SHA-256: 8d2d415af3937c8caf2aef90107883d78a2cc78a6a33f6ef08aeeb7d168273c9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to potentially disposable domains, indicating a link farm or redirection strategy. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to redirect users to malicious external sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d5b74580105ffbac02fda4683eb08d25/zukufulifesulu.pdf In PDF document text
    • http://gayaarchi.com/userfiles/file/20210910155109.pdfIn PDF document text
    • https://nhuadailoan.vn/upload/userfiles/files/27612320683.pdfIn PDF document text
    • https://eksiliotomotiv.com/upload/ckfinder/files/68059556138.pdfIn PDF document text
    • http://2013.letnifestiwal.pl/ckfinder/userfiles/files/6533683648.pdfIn PDF document text
    • http://xn----7sbjvweekof5d.xn--p1ai/files/files/xanilolikalugixiza.pdfIn PDF document text
    • https://toscanafantastica.com/userfiles/file/tokaparijijisax.pdfIn PDF document text
    • https://srilangkapools.com/contents/files/18749999051.pdfIn PDF document text
    • https://digicpictures.com/downloads/93378766985.pdfIn PDF document text
    • http://dmychadla.eu/UserFiles/File/janozanuduzodafomeg.pdfIn PDF document text
    • http://aranysolyomfeszke.hu/editor_up/kilovon.pdfIn PDF document text
    • http://uniontsg96.ru/admin/ckfinder/userfiles/files/loberijuw.pdfIn PDF document text
    • http://www.mousumibanerjee.com/fckimages/file/3138094688.pdfIn PDF document text
    • http://hanasushichoice.com/uploads/files/ziwikoni.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/rakesepomox.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/menonuxipavajepa.pdfIn PDF document text
    • http://astmasme.com/userData/board/file/37208246888.pdfIn PDF document text
    • http://akcompany.vn/uploads/userfiles/file/10550513376.pdfIn PDF document text
    • https://visualmotion.nl/uploads/file/tovaxutawodire.pdfIn PDF document text
    • https://maintogelonline2.com/contents/files/gadetajujidipi.pdfIn PDF document text
    • https://beautydiction.com/ckfinder/userfiles/files/93383900464.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/palixamasefexilurabo.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613df89e94a5e---16419570850.pdfIn PDF document text
    • http://sushinamu.com/uploads/files/govivof.pdfIn PDF document text
    • http://mundialimportweb.com/userfiles/file/33155701450.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=all+android+smartphones+listPDF 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_off0000ecb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB6 17164 bytes
SHA-256: 9b68b9705bc64da3e93bb278fc9c33d276ad3f7307f9ed490489c4ce83832406
font_01_sfnt_off0001194a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1194A 10640 bytes
SHA-256: 0e3049bfe0e705ad6747ca0d8f6508bd59a8679af6cfde5f27cb06ddc7aca2d1
font_02_sfnt_off00013166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13166 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1