Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4f00233ef3d7190…

MALICIOUS

PDF

75.9 KB Created: 2021-09-11 21:22:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 506324960e358bb0b292f200092266cb SHA-1: 07d44f0ff0f119828b1dd73d4a48dd6474596fa5 SHA-256: d4f00233ef3d7190234b8819eb1ecafe61bb151cdf239cfb54a46a65bb090a8b
126 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including a link farm detection and a critical ClamAV detection for a phishing trojan. The presence of numerous embedded URLs, one of which is hosted on disposable infrastructure, suggests an attempt to redirect users to potentially malicious sites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bolt.fo/public_html/userfiles/files/67897602281.pdf In PDF document text
    • http://www.supair-lux.hu/ckfinder/userfiles/files/8263166727.pdfIn PDF document text
    • http://himalayakebab.irafbrothers.com/shipinc/userfiles/files/tukidabujozegisili.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16137075422807---935182555.pdfIn PDF document text
    • https://sofahatinh.com/upload/files/15777480088.pdfIn PDF document text
    • http://indianspringhomes.net/userfiles/files/xepukekuxo.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613be98f2e648---fifuguruganoso.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/90189398934.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/wusodaduvona.pdfIn PDF document text
    • https://hlj-vibration.com/uploads/image/20210908/files/20210908091828.pdfIn PDF document text
    • http://chukysovin.com/img-svc/files/23070505789.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/lanopidewepalatepinikuz.pdfIn PDF document text
    • http://dienlanhhuubinh.com/upload/files/94165814977.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/31792752807.pdfIn PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/fodavopetuniz.pdfIn PDF document text
    • http://monticellotownship.org/userfiles/file/14080953300.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/32683567944.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/xopos.pdfIn PDF document text
    • http://marikitaberbagi.com/userfiles/file/37867057682.pdfIn PDF document text
    • http://palestraarkadia.it/userfiles/files/majozefabevukupe.pdfIn PDF document text
    • http://ccspatti.org/userfiles/file/20400530170.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/90464858640.pdfIn PDF document text
    • https://adikkedua.com/contents/files/kobelezarat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=cinema+one+live+streamingPDF 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_off0000c05a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC05A 10548 bytes
SHA-256: a2b7f2a01a4d47add49c1bad9d5ef3ee9a4ca8de674ea4110ee315e00a2e84c3
font_01_sfnt_off0000d86e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86E 18916 bytes
SHA-256: c139d7e7722d8289a5a3f4c04c34d81eeb36b9735961211bbeafc320d1d2af45
font_02_sfnt_off00010a16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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