Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e0e615c73e53d64…

MALICIOUS

PDF

68.0 KB Created: 2021-09-25 20:14:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fd14e23142bf621c7613be07cf668238 SHA-1: d7b8a33d581e0b49db52951f0528ec7611a78fe8 SHA-256: 9e0e615c73e53d64a0c454c6f40cdd2c17f046acab8bbc7a1d060326ebc391e2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to PDF files hosted on various domains, indicating a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a tactic to distribute malicious content or phish for information. While no scripts were directly extracted, the ML classifier and ClamAV detection confirm malicious intent, likely related to phishing or malware delivery via the linked PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://eatatrudy.com/uploads/files/butelezefutuzivobakuzize.pdf In PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/rolujemekilutodibi.pdfIn PDF document text
    • https://dacola.com/upload/files/nevujapepivifilufagira.pdfIn PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/81614753586.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/27931346418.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/pamojajosavevisume.pdfIn PDF document text
    • http://fgsconsulta.com.br/ckfinder/uploads/userfiles/files/kuzudilasufokuzam.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/79635202462.pdfIn PDF document text
    • https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/jujokapibubar.pdfIn PDF document text
    • https://htijsr.com/userfiles/file/jagigadimivowopowotitin.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/20847664731.pdfIn PDF document text
    • http://chikatere.com/Upload/files/xedajananukasifup.pdfIn PDF document text
    • http://jeykrishnaclub.com/images/file/33953815014.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/vajijamozu.pdfIn PDF document text
    • http://faurau.com/luodan/images/userfiles/file/86704322593.pdfIn PDF document text
    • http://miass.realxenon.ru/uploads/files/24212430608.pdfIn PDF document text
    • http://candientushinko.com/images/file/nozowikokufipa.pdfIn PDF document text
    • https://kolkatanagariksammelan.org/ckfinder/userfiles/files/34908629712.pdfIn PDF document text
    • https://badrivishal.com/media/wuzokisinuresa.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/83945990640.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/84478700850.pdfIn PDF document text
    • http://galenbio.com/images/upload/file/dumoxepisirifevemu.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/rewutepivatumamemisutom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=best+free+app+in+androidPDF 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_off0000acfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACFA 15164 bytes
SHA-256: 90e639310f586b06e56a54119ac633027fc00abe5593752dc0359bc4438061e5
font_01_sfnt_off0000d2b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ead0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD0 10500 bytes
SHA-256: 57eb29894c1863335c623fb69fdb57adfa5edf8edaecd11b792dd349466951b4

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