Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5bd44024629a46a…

MALICIOUS

PDF

79.3 KB Created: 2021-09-16 23:59:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e86b959c10cd13e09df55577187bd7f3 SHA-1: 5cdec32644e73e308020746c6494726375645153 SHA-256: e5bd44024629a46a0cfd750e19078b622a9eb7d34d6746982b8c583e235768f8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs pointing to disposable hosting, suggesting a link farm designed to distribute further malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://garglob.ru/uplcv?utm_term=recover+deleted+sound+recording+android PDF link annotation
    • https://mgc.to/sites/web/upload/files/105204689.pdfIn PDF document text
    • http://boston.pl/fck_pliki/file/bitozazutopivexenoz.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613dbdd065cf6---60199699409.pdfIn PDF document text
    • http://ecolservizinettuno.com/userfiles/files/vokari.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/junerog.pdfIn PDF document text
    • http://ediliziaunoaventi.com/userfiles/files/60544112412.pdfIn PDF document text
    • https://cartolmania.it/file/37774606951.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/makigolu.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/xurewot.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/16048850450.pdfIn PDF document text
    • https://candica.pl/ckfinder/userfiles/files/foradisofosori.pdfIn PDF document text
    • http://kkagro.com/media/images/upload/file/83952716655.pdfIn PDF document text
    • https://lecachet.fr/docs/files/furaziravunabewizaxon.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/52752760700.pdfIn PDF document text
    • http://fishngrill.iorderfoods.com/uploads/files/85558681828.pdfIn PDF document text
    • https://adesso-moosburg.de/images/file/xibikukibisof.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/namirebomavomitixera.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/suspkhiiqk5ppnpcc5fbmhovo7/92428191488.pdfIn PDF document text
    • http://innospectrum.eu/hirlevel/file/ruwezubibab.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/25820421958.pdfIn PDF document text
    • https://cingenito.ca/upload/editor/file/paruwawipogufuwamureme.pdfIn PDF document text
    • https://kompaspt2.com/contents/files/98140413351.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_off0000d291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD291 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eaa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA3 17040 bytes
SHA-256: d1c4c929fe84aa7aa409323ba2154de1d590ff4d521d1637fee442cbf9b45185
font_02_sfnt_off0001167c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1167C 10756 bytes
SHA-256: f88341f6a4b785cc66b897ac0f6062e34ebb98c6201f21e18fb10d52f5b68ded

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