Malicious PDF — malware analysis report

Static analysis result for SHA-256 4edb929e84629efa…

MALICIOUS

PDF

73.5 KB Created: 2021-09-21 01:58:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1ed5f7504faf47327a6b013c4bcbbe20 SHA-1: 4eb593f53a4345589c95f06966eda5120fc5d194 SHA-256: 4edb929e84629efa2d7a0c500af7e17e465aa60505595d8e922b431591ea4543
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of external URIs and the link farm heuristic point towards an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://chcial.ru/uplcv?utm_term=my+beloved+bodyguard+2016+full+movie PDF link annotation
    • http://stigstudiotecnico.it/userfiles/files/20556464991.pdfIn PDF document text
    • http://hangquangauto.com/files/87939173116.pdfIn PDF document text
    • http://cargologicru.com/sadm_files/7901453995.pdfIn PDF document text
    • https://vinocastillo.hu/editor_up/gogatikofowikerikowivo.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/10774367264.pdfIn PDF document text
    • http://www.anaja-inter.org/public/file/62254028718.pdfIn PDF document text
    • https://eko-briketes.lv/userfiles/files/34995326472.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16147ab7fc6894---30852873725.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/89083398923.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///lumeroxutovarewu.pdfIn PDF document text
    • http://ambcavallon.eu/userfiles/files/90569021661.pdfIn PDF document text
    • http://www.moyekolodin.com/files/vinijetixuwugaroluv.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/161446c4e8772f---41309296970.pdfIn PDF document text
    • https://airbays.com/userfiles/file/42640320175.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/rapuguwununilufime.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/votigabevoso.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/32919261301.pdfIn PDF document text
    • https://bevillelecomte.com/ckfinder/userfiles/files/75057077499.pdfIn PDF document text
    • http://reyazahmad.bscsaoner.in/ckfinder/userfiles/files/49421893018.pdfIn PDF document text
    • http://kooijobs.in/ckfinder/userfiles/files/baralusofiwadibax.pdfIn PDF document text
    • https://spacio.hk/attachment/file/rutixusozufi.pdfIn PDF document text
    • https://pkmoscow.ru/ckfinder/userfiles/files/76977520102.pdfIn PDF document text
    • http://myphamnanyno.com/luutru/files/punupabagaledoxedoweduped.pdfIn PDF document text
    • http://dietgame.net/admin/fckeditor/data/file/20210910001818.pdfIn PDF document text
    • http://www.sandipmallick.com/fckimages/file/80776990648.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_off0000ba5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD274 11200 bytes
SHA-256: 9a25b8b71196c4aea26a73af22b41265c2e1abceea7eeec52a0d273b8795eb8c
font_02_sfnt_off0000ec8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8A 16592 bytes
SHA-256: f7e795270431792af0d88b75e51891e74e779aed5f2c81500ccf86de7a1657d9

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