Malicious PDF — malware analysis report

Static analysis result for SHA-256 0718d68b9e9404bf…

MALICIOUS

PDF

72.9 KB Created: 2021-09-13 16:26:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b3f1c24183b0ec53c31eab7469717011 SHA-1: 740238ab280ccaaab2c64f1ed5ae7bbce3cd8013 SHA-256: 0718d68b9e9404bf7f3dd048921b32a8941382bc8017fc15477281b69d316e5d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to PDF files hosted on various domains, suggesting a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, further supporting a malicious intent to distribute or phish. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://dailygameresult.com/editor/UserFiles2/files/57458786568.pdf In PDF document text
    • http://gamjagolla.com/uploads/files/xotewapegaranipowe.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/94327501776.pdfIn PDF document text
    • http://wowbond.com/upload/Fckeditor/file/tevamosexokabajupe.pdfIn PDF document text
    • https://cfi-registration.amyhalter.com/buzzboxgift/img/userfiles/files/sedem.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd421131c5---84467075995.pdfIn PDF document text
    • http://nktrading.qa/file/files/jekariwunalagojinuzok.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/76414785492.pdfIn PDF document text
    • http://nenkin-t.com/upload_img/ck/files/80855256502.pdfIn PDF document text
    • https://ruta.hu/ckfinder/userfiles/files/nudujas.pdfIn PDF document text
    • https://ermolino.mebel18.com/uploads/files/jusukaza.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c72f2b8d9---33172289117.pdfIn PDF document text
    • http://belly.bpv.su/content/files/files/50875695943.pdfIn PDF document text
    • http://iranjobex.com/cache/fck_files/file/dinosutakiraporetawugeje.pdfIn PDF document text
    • http://kleinschadenexperte.com/userfiles/file/18998111301.pdfIn PDF document text
    • http://ping-property.com/user_img/files/wirixubeleli.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/laniwozaroxadimejo.pdfIn PDF document text
    • http://sunpix.ru/img/lib/file/23212072697.pdfIn PDF document text
    • http://zzps.pl/userfiles/file/pojojug.pdfIn PDF document text
    • http://balalajka.nu/media/winisavegiwodupuragito.pdfIn PDF document text
    • https://www.tahitotfaluovodak.hu/ckfinder/userfiles/files/towobiputulujan.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/suwunelumevawe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=login+and+registration+form+in+android+using+json+examplePDF 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_off0000b96c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB96C 11132 bytes
SHA-256: 0981e424619a224454ef424158cb990e9353232108164f39d61e413115c28439
font_01_sfnt_off0000d327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD327 16772 bytes
SHA-256: 74aa09ef14aa0f539600b59fe0ce32d4a4881f5aba982506ce01bef94832e307
font_02_sfnt_off0000fd8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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