Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c4ce1357160223d…

MALICIOUS

PDF

77.6 KB Created: 2021-09-09 19:51:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f95e97bce1910c5b0543015aecac38c1 SHA-1: 59e5d4d58e36571319e0b2ba507575d74b03bf61 SHA-256: 1c4ce1357160223dd47817b56443b05539e3ac02db16ff61b5ca5270e7e90549
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to various domains, flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The primary attack vector appears to be users being tricked into opening this PDF, leading them to a network of sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://zanethompson.com/userfiles/file/19939165205.pdf In PDF document text
    • http://vngo-cc.vn/cooker/public/files/dimokanefonukem.pdfIn PDF document text
    • http://xhiehchin.com/Xhieh_News/_file/xekoxefejuvudunoronoma.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/12940227687.pdfIn PDF document text
    • http://ktcz.eu/files/files/bedurilanajakuberedunemaj.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/11088292839.pdfIn PDF document text
    • http://dirpub.org/editor/ckfinder/userfiles/files/fofimikarexubiruvariva.pdfIn PDF document text
    • http://webspace.mysdam.net/images/newsletter/files/6495955637.pdfIn PDF document text
    • http://ilonew.tasksplan.com/ckfinder/userfiles/files/96242782778.pdfIn PDF document text
    • http://canyonmeadows.org/userimages/palumagidubupanozij.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/21415798584.pdfIn PDF document text
    • https://mangallagn.com/images/file/fojazumomaxoz.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/rabofejamivarakubi.pdfIn PDF document text
    • https://kstraders.com/userfiles/file/fujutepuwekokixefurud.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/werune.pdfIn PDF document text
    • http://szjg.hu/images/file/10047557642.pdfIn PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/17240835396.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613155b191792---xikuku.pdfIn PDF document text
    • http://www.kigimex.com.vn/ckfinder/userfiles/files/jinotivaxirojale.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/554d81c10beffb676b4a444d8e242386/95632953907.pdfIn PDF document text
    • https://edubox.mn/uploads/users/0/files/ginalow.pdfIn PDF document text
    • http://galenbio.com/images/upload/file/dumoxepisirifevemu.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/59963901262.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=daily+average+screen+time+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_off0000c88e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC88E 10896 bytes
SHA-256: d50d6202c3a5ac3863c70b101faa097b093bd8df61fd9b5d134b2b690538248d
font_01_sfnt_off0000e18e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE18E 18132 bytes
SHA-256: a476508aabf902e649c48284f879931ba813c97f6c1a2bb6477fc1123283c0c8
font_02_sfnt_off0001110d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1110D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1