Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f433eb609b13bcf…

MALICIOUS

PDF

71.3 KB Created: 2021-09-17 18:37:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6f6e0faf8c498ed454dfa69cec4e2063 SHA-1: 42e57918c7cdeab013f315ea3a8897d36eca088e SHA-256: 3f433eb609b13bcfb82581a3ada498c6f854f1f9d29587b97da34dae3e547c77
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains multiple external URIs, including one pointing to a raw IP address, suggesting it's designed to redirect users to potentially harmful content. The PDF structure and numerous links on disposable hosting further support a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://ornito-silesia.eu/userfiles/file/wufozibedisakimikusawerel.pdf In PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/bc33237eeaec7022884c203053c940ca/59355965195.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/zobakewewadugewugobaroz.pdfPDF link annotation
    • http://monikaknoblochova.com/userfiles/file/72376449305.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/94549265859.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/40356579528.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/65143065225.pdfIn PDF document text
    • https://jensbrode.de/files/file/99397722648.pdfIn PDF document text
    • https://1snrpaulista.com.br/ckfinder/userfiles/files/savozumikaweb.pdfIn PDF document text
    • http://gamax-moto.cz/data/dokumenty/28464174892.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/butisawofatemuba.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/65510023750.pdfIn PDF document text
    • http://ck-tct.ru/userfiles/file/likikozovu.pdfIn PDF document text
    • http://psychologadamczak.pl/userfiles/file/zoxenaxevezewupeve.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/26406933413.pdfIn PDF document text
    • http://geomanteia.com/userfiles/files/73066237701.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/37951676443.pdfIn PDF document text
    • https://masukpt1.com/contents/files/43150484165.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/rupaxigilasanuxuj.pdfIn PDF document text
    • https://dalba.net/other_files/File/vewazufixukat.pdfIn PDF document text
    • http://usatovl.ru/upload/fckeditorfile/29958947477.pdfIn PDF document text
    • http://regmac.net/userfiles/files/61686102357.pdfIn PDF document text
    • http://noithatphathuy.com/Images_upload/files/zetubidavasisosobiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=7+movierulz+plzPDF 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_off0000b5e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5E4 16532 bytes
SHA-256: 420ab84ea17e718e20671e81a795c2967f4380d06820f2838d5f1ea317ce0f3f
font_01_sfnt_off0000e06e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE06E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF885 10060 bytes
SHA-256: 0d47b54b2827460394ab90cfa5e19eef50962f2a230c29ca3dc9107728feebda

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