Malicious PDF — malware analysis report

Static analysis result for SHA-256 eae541cf0f61302e…

MALICIOUS

PDF

79.6 KB Created: 2021-09-11 08:53:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c6b4b098c10587ee55afe19b3ed5112e SHA-1: 9ff1ce4747010968a17da2b0859bfb2529a6c170 SHA-256: eae541cf0f61302e23e7ce7de02487cd7fc92b7e283f9a33b1564878f17c3697
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, with several heuristics indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself facilitates redirection to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/64a392f270422e532e2f6692ad021313/mukigerebosobed.pdf In PDF document text
    • http://soluzionebenessere.eu/userfiles/files/86923232831.pdfIn PDF document text
    • http://yousefmaktabi.com/ckfinder/userfiles/files/gobut.pdfIn PDF document text
    • https://mycocoa.org/images/upload/files/gosubonuripew.pdfIn PDF document text
    • https://salwangurugram.com/files/80060112787.pdfIn PDF document text
    • http://tw-jia.com/uploads/files/202109022004422712.pdfIn PDF document text
    • http://pneusmarene.it/images/file/7879901771.pdfIn PDF document text
    • http://ambulatorioveterinariovianello.eu/userfiles/files/75693841521.pdfIn PDF document text
    • http://vdavloeren.be/userfiles/files/18729739176.pdfIn PDF document text
    • https://taxfirma.com/userfiles/file/xevatamonogogajedowevavi.pdfIn PDF document text
    • http://grasslandtj.com/upload/files/75739622040.pdfIn PDF document text
    • https://isleo.com/i_photos/file/laloxebi.pdfIn PDF document text
    • http://hamishehbaharcarpet.com/My_Project/Hamishe_bahar/ahar_img/files/18169203349.pdfIn PDF document text
    • https://nasikampung.info/contents/files/79937411208.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/98520786859.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/161349f9106fa1---82363247124.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/mumiroranemefelor.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/gemov.pdfIn PDF document text
    • http://chia4kids.ru/ckfinder/userfiles/files/gexebum.pdfIn PDF document text
    • https://r4binsh4h9-att.com/contents/files/zamef.pdfIn PDF document text
    • https://tekartltd.com/upload/files/65814082376.pdfIn PDF document text
    • https://xylemleads.com/userfiles/file/49102583970.pdfIn PDF document text
    • http://arnoldbolingbroke.com/ckfinder/userfiles/files/30653965673.pdfIn PDF document text
    • http://thehedgerowchronicles.com/ckfinder/userfiles/files/74997203008.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+disable+device+administratorPDF 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_off0000d27b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD27B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8D 17780 bytes
SHA-256: cea23ee0600e33ad8da7a185693ee372bc09f8d912169a771f7cf98f7d8a22d5
font_02_sfnt_off000117f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F8 10816 bytes
SHA-256: 5f37cdafb7ba40ba4c41994978120c65bba050ff24271bf2a9a015b18dc1ded8