Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9f4c85d29f5640c…

MALICIOUS

PDF

78.1 KB Created: 2021-09-23 07:55:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b0591e57e31ae2c4790094f9840bca3f SHA-1: f10795861f73d07e4e8dc974b6f19c4e5c9d3c9e SHA-256: f9f4c85d29f5640cec0dc3a9693c64ccae55e0bdc065baf34e639d396432fb76
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, containing numerous external URIs pointing to various domains, likely to obscure the final malicious destination. The document body is heavily obfuscated and appears to be generated content rather than user-readable text.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/af1c631775b07373744ea2c8a4b44496/18133770449.pdf In PDF document text
    • https://kovtec.pl/eurostyl/photos/file/vokimavuloruzugepe.pdfIn PDF document text
    • https://herfection.herfection.tw/upload/ckfinder_temp/files/20210902125515.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/podejigaxi.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/xivolinonunapeto.pdfIn PDF document text
    • http://taxplus.in/images/contentimages/files/95136309408.pdfIn PDF document text
    • http://topliving.sk/userfiles/file/xorufafupekotazebozilo.pdfIn PDF document text
    • http://klenderbio.com/upload/files/79654313306.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/jazibawapamef.pdfIn PDF document text
    • https://gplacestracker.com/userfiles/file/boxonepu.pdfIn PDF document text
    • https://armature.ir/cache/fck_files/file/mudupide.pdfIn PDF document text
    • https://peptidturkiye.com/ckfinder/userfiles/files/nilab.pdfIn PDF document text
    • https://rafautama.com/uploads/file/36116329023.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/xafawugodulopu.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/53175527627.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/79101456876.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/53450531199.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/ruribu.pdfIn PDF document text
    • https://27061010.com/uploads/files/202109182130106165.pdfIn PDF document text
    • http://edilgroupdigiovanni.it/userfiles/files/fawenelopito.pdfIn PDF document text
    • https://lazerom.pro/media/file/bupuxexesigurokip.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/161431d92c1f33---vozadolikapi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=sapo+y+sepo+inseparables+pdfPDF 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_off0000cb20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB20 18288 bytes
SHA-256: ac373051223e2a31dd032f8d3ee74bdcf5f7ef1b31a149ea82c336b27563e6f7
font_01_sfnt_off0000fa99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B0 10724 bytes
SHA-256: 3db24e3a4f73d0410f552a487f3db119cc84e5a0773932142bf0f8491ab39691

Open this report in the interactive analyzer, or submit your own file for analysis.