Malicious PDF — malware analysis report

Static analysis result for SHA-256 96d967bf58af1f38…

MALICIOUS

PDF

76.9 KB Created: 2021-09-20 03:30:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 774c7c1fc1c8e28bfce87e28135a1181 SHA-1: 2d1cfbae2d2bbc7064082e9fd55a62d651aaad34 SHA-256: 96d967bf58af1f383be85907ec206905ad566be38815af5b075ed1f7ef48bfa1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://2446665a.ru/ckfinder/userfiles/files/64201017553.pdf In PDF document text
    • http://iranjobex.com/cache/fck_files/file/degigeduguxiresegiwefo.pdfIn PDF document text
    • http://dom-2000.ru/ckfinder/userfiles/files/mitarapetijoga.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210910211835_vmjmip.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/37517378723.pdfIn PDF document text
    • http://wedding-box100.com/uploads/files/202109150228529933.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/11992234723.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/0c301080fc08686d9fef49371cc27d0b/logefunikenumatisiru.pdfIn PDF document text
    • https://blugarden.eu/file/pozelenokedolafofuzox.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/totunoxopukatoziwato.pdfIn PDF document text
    • https://ksmt.edu.np/assets/ckfinder/userfiles/files/29367160120.pdfIn PDF document text
    • https://horacebatten.com/ckfinder/userfiles/files/rixuluwa.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/26034181142.pdfIn PDF document text
    • https://vicareyou.com/userfiles/file/mavumijagunaj.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/30631999598.pdfIn PDF document text
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/59958776542.pdfIn PDF document text
    • https://riminabda.sk/userfiles/file/ramedasig.pdfIn PDF document text
    • http://ketphatthinh.vn/upload/files/givazuwuxege.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/jefagexiti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+use+pc+keyboard+on+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_off0000c745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC745 17368 bytes
SHA-256: dbf7392bcd0dc815e2cfdf8d7af78571adecd9db6fbb13403dab8e44e02dba84
font_01_sfnt_off0000f486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF486 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9D 10984 bytes
SHA-256: 52d5f30f706460cde24361002c410ae826ab54df88131bd9a5090ddde3591c91

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