Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0a719f245080ec8…

MALICIOUS

PDF

73.3 KB Created: 2021-09-22 11:22:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4adcbcc6fd5310ae74dbe53f7707000b SHA-1: 9d0350868a5893da3830b9682d9d9d7d94e95eab SHA-256: a0a719f245080ec8de2f7327d0980abb46301b51000c66e6e4067af348c255d1
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting, and exhibits characteristics of a link farm. The primary attack pattern involves directing users to external, potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://www.agencesramos.com/ckfinder/userfiles/files/115855310.pdf In PDF document text
    • https://edusfera.pl/upload/file/138102139.pdfIn PDF document text
    • https://taucaotoccatba.vn/images/news/files/wexexipikaxexusomato.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/9196253868.pdfIn PDF document text
    • https://nidi.mk/ckfinder/userfiles/files/36405308959.pdfIn PDF document text
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/milolovowirofan.pdfIn PDF document text
    • http://xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/nepojetotegizutorata.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/dadilisez.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/ruxoxatosewagewazun.pdfIn PDF document text
    • https://tempatpasang.com/contents/files/jovedisepodori.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/4051298411.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/gomipixukunenipajozanejot.pdfIn PDF document text
    • http://kennycojewelry.com/userfiles/files/202109/1630493483.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/sikesojafisapofuveposuku.pdfIn PDF document text
    • http://spbmedaks.ru/sites/default/files/uploads/gaxuvofegimuditejuxi.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16142dd7d3f87d---bomorazisezitive.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/42130724087.pdfIn PDF document text
    • https://ptogel1.com/contents/files/69286271221.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/vadamesusomizedoga.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/xisirovuduwifedoxojubosul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=pokemon+fire+red+latest+versionPDF 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_off0000b46c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB46C 10672 bytes
SHA-256: 2e83f76f62ebb52d80139a4dab2363237a5dfbbf792fc10e50351f8b93f7b5af
font_01_sfnt_off0000cce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e4f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F9 19100 bytes
SHA-256: 1db5c6c95409f22d959f1538fa728a133c54f4bb1aed9a27959ac7712dc22e95