Malicious PDF — malware analysis report

Static analysis result for SHA-256 172e4c285d21b931…

MALICIOUS

PDF

69.2 KB Created: 2021-10-01 19:04:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 46aa16a6fcfc21a549dc0bc212246a06 SHA-1: f8dc6b270d6a3639993923a437bedfbf7268faa1 SHA-256: 172e4c285d21b931229f88d65af059869df27748aa73d25e5aa70df38e928e37
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. This suggests the document's primary purpose is to redirect users to potentially harmful websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://drafthe.ru/uplcv?utm_term=good+recon+expert+combos PDF link annotation
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/161334a4a98f97---36473551958.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///wokuxafure.pdfIn PDF document text
    • http://na3.it/misc/file/77543598154.pdfIn PDF document text
    • http://cochemical.com/upload/files/65708017178.pdfIn PDF document text
    • https://www.aicsmindia.org/ckfinder/userfiles/files/wunotej.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/sikifixupipapu.pdfIn PDF document text
    • http://www.w.radeton.cz/ckfinder/userfiles/files/gozoxunumir.pdfIn PDF document text
    • https://simbhaolipower.com/images/file/88968635964.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/tigofiligiluzobedik.pdfIn PDF document text
    • https://digireg.se/upload/39642652187.pdfIn PDF document text
    • http://tubesealer.com/uploaded/file/627299179614029da0803c.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/xidikos.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0ea46f724---48290484505.pdfIn PDF document text
    • http://tdbakademi.org/userfiles/files/zurisimexodoxu.pdfIn PDF document text
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/wajedi.pdfIn PDF document text
    • https://www.mppoa.cloudlinesystems.com/assets/ckfinder/userfiles/files/nudoxuze.pdfIn PDF document text
    • http://arucax.am/user_images/file/voxubosizexubajum.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///dutodabevidelelepebafaxe.pdfIn PDF document text
    • http://wwsm-hk.com/files/file/25243955918.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/jibodewevorijix.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/20205842901.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/92712228161.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/paxit.pdfIn PDF document text
    • https://nhatngudongkinh.phapluatvietnam.com/upload/ckupload/files/38969770447.pdfIn PDF document text
    • http://scuolascifondocortinadolomiti.it/userfiles/files/vezawu.pdfIn PDF document text
    • http://sharon-barron.com/userfiles/files/15725422540.pdfIn PDF document text
    • 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_off0000b11e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB11E 14940 bytes
SHA-256: 8b702934e16d326d41854037308ac64921250a6c76ddcc5bce99d7600206a6b6
font_01_sfnt_off0000d6b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED0 10656 bytes
SHA-256: 9729ac289ca4ffb7ca9b29f99a707c7ce2b5908d2fbf518219177c2f6f1d1cab