Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f76dc482df4bad9…

MALICIOUS

PDF

85.1 KB Created: 2021-09-14 14:35:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5ca5dbe44d544f54d871126d467ee731 SHA-1: f7155986b3b2e05e999e9135916019caf0318af9 SHA-256: 7f76dc482df4bad92388d587a3cd31721694a4ae2e6aa73ce2d1f4d5692c08a5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic firings point to the document functioning as a link farm, containing numerous external URIs that redirect to various PDF files hosted on different domains. This suggests a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/zuwilatumefukifafixekajig.pdf In PDF document text
    • https://asfus.net/virgsurv/userfiles/file/gasevuxelikivoto.pdfIn PDF document text
    • https://deepex.hu/hirek/files/refalujivasedejosi.pdfIn PDF document text
    • https://ubitanduk.com/contents/files/32638103189.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16313708892923.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/ramosesedorag.pdfIn PDF document text
    • http://gmkms.net/upfile_editor/2021/files/24357769230.pdfIn PDF document text
    • https://merohamro.com/ckfinder/userfiles/files/40544345888.pdfIn PDF document text
    • http://www.serge-valentin.net/ckfinder/userfiles/files/12233620638.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/nataronaxofemem.pdfIn PDF document text
    • https://groupunsur3.com/contents/files/gixopitubigalorulilexa.pdfIn PDF document text
    • http://gartenbaukoeln.de/uploads/files/dufepi.pdfIn PDF document text
    • http://agavietnam.com/img/files/lodasofekejotiwakegev.pdfIn PDF document text
    • https://ms02bet.com/contents/files/65959131832.pdfIn PDF document text
    • http://dryoucosmeceutical.com/userfiles/files/25322658116.pdfIn PDF document text
    • http://maudchristan.nl/ckfinder/userfiles/files/nikefedijejuloke.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/pikef.pdfIn PDF document text
    • https://afritransport.com/app/webroot/files/file/mafuv.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16130dd25cbc86---99002201881.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/49751341265.pdfIn PDF document text
    • http://union.travel/ckfinder/userfiles/files/49621984366.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/76459375584.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=iphone+6+s+plus+price+in+bdPDF 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_off0000e34a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34A 19276 bytes
SHA-256: f726577236148985107b831436dc5ed4634abd85d02674d5640b53a91f23257d
font_01_sfnt_off00011637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11637 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E4E 10708 bytes
SHA-256: 89515904a93ae8c22bea56659b793183ab0428b508dc37139dead52bb9b83c68

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