Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e963881057f7716…

MALICIOUS

PDF

71.4 KB Created: 2021-09-25 19:56:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d2342ca99671efa574b777d80c55cc00 SHA-1: a8e31810f5b8e9a397de93571b9b846ea8d712c0 SHA-256: 8e963881057f7716a950852a94846ee81a277e2b0ec69aec64882dc6667be482
126 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. The embedded URLs, while many are marked benign, contribute to the overall picture of a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://ordineveterinarireggioemilia.it/userfiles/files/82865469267.pdf In PDF document text
    • http://filippodelvita.com/demo/userfiles/file/zadol.pdfIn PDF document text
    • http://www.reeder.ee/files/filemanager/mikag.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/9342800541.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/nosetasaterininiji.pdfIn PDF document text
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/66431992728.pdfIn PDF document text
    • http://travelspace.pl/userfiles/file/werepiri.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/52093205345.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/84766610164.pdfIn PDF document text
    • http://888spirits.com/userfiles/file/71663651980.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/kefetevidif.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/bolebin.pdfIn PDF document text
    • http://poliinc.com/upload/files/77214693531.pdfIn PDF document text
    • https://ms02bet.net/contents/files/8241489448.pdfIn PDF document text
    • http://bjqyms.com/filespath/files/20210902211155.pdfIn PDF document text
    • https://aksusu.com/upload/files/rexudedivikubagu.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16148164d6d11e---vudejuzeseju.pdfIn PDF document text
    • https://speculatio.in/userfiles/file/30175700020.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/21488162463.pdfIn PDF document text
    • http://inimtrento.it/userfiles/files/86148359008.pdfIn PDF document text
    • https://fiscalonline.ro/app/webroot/files/userfiles/files/12380515998.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/lapitozoxezoxonuburupag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=fortnite+download+on+mobile+phonePDF 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_off0000b295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB295 17444 bytes
SHA-256: 5ec936cb3f49bf5a7b98f6dbc5366bb86d3fba8b34b42ce7eb388088941ce623
font_01_sfnt_off0000dfaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f7c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C1 10692 bytes
SHA-256: 3dbc13ab8c22929748a5450d58464296d5babc52efb98b8572f4807344e2bd0f

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