Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc8501ce942c4bcd…

MALICIOUS

PDF

86.5 KB Created: 2021-09-19 06:35:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cb1a3d4a1c75f887bb552feeaf1d6d56 SHA-1: cfb17b84d22ec5607f301b7285682d09aa3dee1f SHA-256: dc8501ce942c4bcd5edf561ab13236d03fa5ee74758089092e9464847bf7ddb2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to disposable hosting and are structured to appear as download links, suggesting a phishing or malware distribution lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights the use of link farms on disposable hosting, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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=mission+impossible+rogue+nation+mod+apk PDF link annotation
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/161342698409ba---83517844916.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/rifofat.pdfIn PDF document text
    • https://hw-power.com/uploads/ckfiles/files/613715d0706ca.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/35457202259.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/99973463519.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d361e1d313---binivataxasora.pdfIn PDF document text
    • http://vouchertiket.com/airplane/ckeditor/uploads/files/fawipepogekufikoworogale.pdfIn PDF document text
    • http://annabarons.lv/files/files/jofor.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/zupapidukelerozin.pdfIn PDF document text
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/10143743880.pdfIn PDF document text
    • https://avela.md/userfiles/file/dazetaxufegapudagusev.pdfIn PDF document text
    • http://sobateracota.ro/mm/file/wazijel.pdfIn PDF document text
    • http://danangsculpture.com/uploads/image/files/retewagi.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/55622849445.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/fuletiwesazojiwunovumirat.pdfIn PDF document text
    • http://virtualcharityevents.com/vce_cake/files/files/81040329344.pdfIn PDF document text
    • http://geombiagioschettino.eu/userfiles/files/rovirulimujuriwube.pdfIn PDF document text
    • http://www.photonics-science.com/ckfinder/userfiles/files/53668299033.pdfIn PDF document text
    • https://raljob.com/userfiles/file/gigubaxavupibojefe.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/52483591185.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/lisaman.pdfIn PDF document text
    • http://isdoor.ru/uploads/files/nixafitumowuxi.pdfIn PDF document text
    • https://roshnaai.com/ckfinder/userfiles/files/54331586578.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/48718173107.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_off0000e526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE526 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD38 20152 bytes
SHA-256: 10386e2aa69a43a939a32b908809d1d6eed45c0528a106411db9be1928e4903c
font_02_sfnt_off000132a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132A8 11060 bytes
SHA-256: 79f72925ae09942919a0bfe4773870d5e9cfd978bc4c2bc9ed70685ab7879432

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