Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9b4aa6495257fdf…

MALICIOUS

PDF

84.2 KB Created: 2021-09-18 04:33:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e899bc003e2c3fb8e5bed171a20fc965 SHA-1: 07e8b9d4daccd1a9f495a22027f84763411825dd SHA-256: f9b4aa6495257fdf43ec21a718699c2d9baaffc3712c06aee4706b93e01d62b2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of a link farm on disposable hosting, coupled with numerous unknown URLs pointing to other PDF files, suggests a phishing or malware distribution campaign. While no scripts were extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to lead users to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161414908e8678---80873662277.pdf In PDF document text
    • https://hotelpancharatna.com/assets/userfiles/files/rajinux.pdfIn PDF document text
    • https://smg.bid/ckfinder_userfiles/files/gafonavotikix.pdfIn PDF document text
    • https://labelmarket.eu/data/file/62762396055.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/daguwikanatidisaratitukep.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/99604620105.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/febetetosapuvorumas.pdfIn PDF document text
    • http://pataibicaj.hu/userfiles/file/32355265394.pdfIn PDF document text
    • http://gavionescodeinsa.com/userfiles/mobufebed.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-9-11/20210911043834957886.pdfIn PDF document text
    • http://naturalfurnish.com/userfiles/file/gaponovanaru.pdfIn PDF document text
    • http://sensitiva.fi/UserFiles/File/bogidifoxaxopog.pdfIn PDF document text
    • http://usagimatur.com/files/others/2287641679.pdfIn PDF document text
    • https://commonlawhouse.in/userfiles/file/petuwogexekudakedulifufu.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/zoruvukutanudobaguxa.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/nutuxatedoworud.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/joketudawomuzet.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/161450dab03776---jujitusawixemo.pdfIn PDF document text
    • http://factblogs.com/uploaded_files/userfiles/files/86243459923.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/82960947728.pdfIn PDF document text
    • http://peoplefineart.com/assets/202109/files/20210912045132720895.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/gekinodoze.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/gerejepopesumunam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=vsdc+free+video+editor+for+androidPDF 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_off0000e176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE176 10456 bytes
SHA-256: 81c12ebcb29be6030a8da506b011fb4ca46283b1522964fda44f7359098a9ed8
font_01_sfnt_off0000f961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF961 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11173 19164 bytes
SHA-256: 45dbc93219dddf27fe35083546841b15ae2c86f173773c7c516073f729251532