Malicious PDF — malware analysis report

Static analysis result for SHA-256 83df9afa709c5066…

MALICIOUS

PDF

70.2 KB Created: 2021-09-24 21:16:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 96d4c3e0be5967d6cfe25f810729afc0 SHA-1: 15374324ab2307bd75a024ad48455d835f9b8af2 SHA-256: 83df9afa709c5066d2d2504e7c9fef791961ce5770e8440390f489555ff6954e
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to external sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates these URLs are part of a link farm, suggesting a malicious intent to manipulate search engine rankings or distribute further malware. ClamAV and ML classifiers also flagged this file as malicious, supporting the assessment of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://gornjastubica.hr/files/lanudejojuvowidunafak.pdf In PDF document text
    • http://haiqi-machine.com/d/files/gojud.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/38131590139.pdfIn PDF document text
    • http://luatminhnghia.com/img/files/67002425110.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/19461360958.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/sipad.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/zerugemeton.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/detefulam.pdfIn PDF document text
    • https://jasmijnbloemengroen.nl/userfiles/file/76012213906.pdfIn PDF document text
    • http://upasamed.org/Content/uploads/files/votejerim.pdfIn PDF document text
    • http://we-women.de/default/files/uploads/file/futepewakelofepax.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/fosovune.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/fojedapotonopanexo.pdfIn PDF document text
    • https://basisangka.com/contents/files/gujedageti.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/gezubakuwonoxenodib.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/fuxaros.pdfIn PDF document text
    • http://mingmitrcoffee.com/user_img/files/38582689881.pdfIn PDF document text
    • http://polletnv.be/uploads/files/migafopaxuxosifab.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147264d53dd4---82931507594.pdfIn PDF document text
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/lonulokixiwibefidofifero.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16132ee9b91390---xawozurokowubomagedaf.pdfIn PDF document text
    • http://fst-uinsu.net/userfiles/files/25883222525.pdfIn PDF document text
    • https://hinaweb.com/upload/file/jewiroxezugalonazinizipu.pdfIn PDF document text
    • http://ukwoodrecycling.com/userfiles/files/70260158723.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=wrc+game+for+android+free+downloadPDF 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_off0000b215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB215 10632 bytes
SHA-256: 80a8beaed0d1cdcde02a4a4347bebe9fa10bc0162de32ff8196a1a876ec82525
font_01_sfnt_off0000ca31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA31 16012 bytes
SHA-256: c337adb99222128208c767abbb99fbeed66f20561da59fc3b734451fe4e3fbe1
font_02_sfnt_off0000f28f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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