Malicious PDF — malware analysis report

Static analysis result for SHA-256 c643d5dc7da3e014…

MALICIOUS

PDF

80.8 KB Created: 2021-09-14 14:07:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: eabe0d4ef5ee6599420ba46581f5b1b5 SHA-1: ff43805953d408cfa20f69eceb1ca54649c8e100 SHA-256: c643d5dc7da3e014893240bbcf8d0581c462529874b8dc9e011124f0aa85d405
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to suspicious domains, suggesting a phishing or redirection scheme. The PDF structure and the presence of external URI heuristics further support its role as a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://lenaoyunlar.net/calisma2/files/uploads/tusevozitemoxukagosu.pdf In PDF document text
    • https://ashasuchikala.com/ckfinder/userfiles/files/lawenapaxizokute.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/foretozovine.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/kunuxewikuloxafu.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/zopifikefukotogu.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/zatoturuxupuwa.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/povinuwije.pdfIn PDF document text
    • http://architettipassarinmarzotto.com/userfiles/files/piletowigirufabumesepovap.pdfIn PDF document text
    • http://avesta-hmora.boj.se/uploads/userfiles/files/tuzudewotagaxupixavoxoni.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/kitinizowolivif.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/50a0e293dc6c32ea4de72736f5a46b1c/96951204621.pdfIn PDF document text
    • http://ohsongpharm.com/ckfinder/userfiles/files/sifububilegubijum.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1613668ae2c356---33192841406.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/tunojakilaxinefed.pdfIn PDF document text
    • http://cissi.it/userfiles/files/66740081529.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/xatanopofowawewisegit.pdfIn PDF document text
    • http://artospace.com/pics/file/89769366590.pdfIn PDF document text
    • http://oris-am.com/editor_up/78964936992.pdfIn PDF document text
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/repubetelenosazikevarezo.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/79343437164.pdfIn PDF document text
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/futorizafugega.pdfIn PDF document text
    • https://srccaa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/96349065648.pdfIn PDF document text
    • https://xylemleads.com/userfiles/file/tobuxizoboxufupikej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=f+droid+top+appsPDF 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_off0000d9b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B1 10080 bytes
SHA-256: 796d000b5b8f53adc7ee6c8012c4b6ab088bc7b1c0111256fad8d307cfa5e46e
font_01_sfnt_off0000f034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF034 17380 bytes
SHA-256: e25c0205dbbd3bf5f1685ba7b3a379f8091ba39abd08a307ca18f8af0c7e663e
font_02_sfnt_off00011d79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1