Malicious PDF — malware analysis report

Static analysis result for SHA-256 6990a9ce5a2181b9…

MALICIOUS

PDF

82.8 KB Created: 2021-09-16 20:37:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 408f2d8740fa4a5ed478d3ba1716ca2f SHA-1: 27729e9203284e3aa41052ffc45f3b3bbdf811d6 SHA-256: 6990a9ce5a2181b9f8bbca889455d07cb85ebc9d29869e7f139e46a689b2c958
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, with a high heuristic score indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. The sample's structure and the presence of multiple PDF links point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://bxbrdh.marketsearching.com/upload/files/72147687087.pdf In PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/17e5aec30601e4dd58e4bf662b1f8eff/28563198864.pdfIn PDF document text
    • http://paraleumarian.ro/app/webroot/files/userfiles/files/burojabawojazadufafifevir.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/22342379965.pdfIn PDF document text
    • https://e-ssuances.com/ckfinder/userfiles/files/16959621138.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16137e43ea779e---46645276139.pdfIn PDF document text
    • http://koala-al.com/d/files/tovux.pdfIn PDF document text
    • http://pho32shabu.com/uploads/files/56680112013.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/virajebataneresaxifut.pdfIn PDF document text
    • http://eastindiaspray.com/suvra/eastindia_spray/files/58299369417.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/fewitawefe.pdfIn PDF document text
    • https://nezrenpin.com/calisma2/files/uploads/ronapusuzorewutof.pdfIn PDF document text
    • https://rowsontw.com/shopadmin/upload/files/66851878639.pdfIn PDF document text
    • http://sinoorchids.com/image/file/16191785414.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/kodixiw.pdfIn PDF document text
    • http://ingore.cn/upload/files/davipegufegamekonolabulu.pdfIn PDF document text
    • https://flims.atelierleuthold.ch/userfiles/files/94561675705.pdfIn PDF document text
    • http://gnatowski.pl/attachments/file/nogenutovesebomot.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/liferasuro.pdfIn PDF document text
    • https://samsungklimamodelleri.com/upload/ckfinder/files/34416409774.pdfIn PDF document text
    • http://eternoohydro.com/d/files/wikomewibivelufu.pdfIn PDF document text
    • https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/rutevabevemixubezemogo.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/fevetoj.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/47046742907.pdfIn PDF document text
    • http://superazs.ru/images/news/file/nosajupixajunuvower.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+see+photos+from+private+account+on+instagramPDF 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_off0000db61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB61 11124 bytes
SHA-256: dfd90ba8c0092ffd1622ca3dc66fda4c8a4597a1913727d20c212ed50c32f1ff
font_01_sfnt_off0000f544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF544 18412 bytes
SHA-256: 3ec8a5df38c1a77bd0f8b4ce927ea1554e2d4f80f4aeab7dcd46d40d98d7a390
font_02_sfnt_off00012509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12509 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1