Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9369d6be286acb5…

MALICIOUS

PDF

70.3 KB Created: 2021-10-01 20:48:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 796ee02a69d5fef9399efe4e8106725e SHA-1: 2bed27a71ccefeeba0a118a6e67aba8f207ecb03 SHA-256: e9369d6be286acb5bb8915f9b5d6914f16096e6d547e14d3d1c3c386e4dff0d8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, with heuristics indicating it is a link farm on disposable hosting. The PDF contains numerous embedded URLs, many pointing to suspicious domains, suggesting a phishing or redirection attempt. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://cructi.ru/uplcv?utm_term=six+letter+words+starting+with+w PDF link annotation
    • https://moiatakashta.com/userfiles/file/56922174643.pdfIn PDF document text
    • http://upnbkk.com/file_media/file_image/file/pokimerepugulozusuzowekep.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/duvomajegogupuwiwiwa.pdfIn PDF document text
    • http://ieltsadd.ir/cache/fck_files/file/lodubijotofeveg.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-11/20210911164251137197.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/78728392152.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/3374957199.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/wonibitirevobogoj.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/91159359310.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/dimurilusujemiwum.pdfIn PDF document text
    • http://www.smpnuenen.nl/images/files/36870742563.pdfIn PDF document text
    • http://www.eau-msu.ru/ckfinder/userfiles/files/rajipipon.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/serotixepiduduj.pdfIn PDF document text
    • http://www.scea.edu.mn/ckfinder/userfiles/files/31137828071.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/suvem.pdfIn PDF document text
    • https://thefertilizerproductionline.com/d/files/gumasoxijowawetuz.pdfIn PDF document text
    • http://htwy.com/upload/file/mijesu.pdfIn PDF document text
    • https://cs-nippon-cp.com/mailmagazine/upload/files/96843045259.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/40567831130.pdfIn PDF document text
    • https://pernambucoimortal.com/imagens/files/72002933514.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/femafigivuwosidu.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/69282241687.pdfIn PDF document text
    • http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/gotamiwavalobakipilez.pdfIn PDF document text
    • 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_off0000aefe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC715 10788 bytes
SHA-256: 9666d220418f4936fe1221c8aa355ecb297578d577072442ee02ef8a8bf618b2
font_02_sfnt_off0000dfb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB0 17120 bytes
SHA-256: e02d15a622878562e5bdadf6f70d4deac20bde53846bb2cd8a9472cf3f81d371

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