Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bfbb5ed8f275161…

MALICIOUS

PDF

76.3 KB Created: 2021-09-22 14:12:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9dfa8aef84cd5bf19bbb4ab323b919b2 SHA-1: aefbe773d2f83db3214bf7c2d0e434e8f13d9174 SHA-256: 0bfbb5ed8f2751614d367233e51eb7017ba7088a32338492e2b1e7537e91b22c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a high number of embedded URLs, many pointing to disposable domains, indicating a link farm designed to obscure malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and numerous external links are indicative of an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://estatepie.com/files/userfiles/file/76804673279.pdf In PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/70621920209.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/3faf6f3cb9edc012d5e3bd503a7c512f/sivexaraxut.pdfIn PDF document text
    • https://stormester.no/files/file/68455106636.pdfIn PDF document text
    • http://tornyanggrace.com/upload/file/guwabizap.pdfIn PDF document text
    • http://rent2day.ca/ci2/userfiles/files/nevulelulefifubifen.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/kaduvujixadogerabidowijem.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/3698798493.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/dodajebujebedibexaganok.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/32331455020.pdfIn PDF document text
    • https://www.assofmt.org/ckfinder/userfiles/files/bojewulig.pdfIn PDF document text
    • http://zamel2.pl/userfiles/file/46316756787.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210918165221.pdfIn PDF document text
    • https://totalsewa.com/userfiles/file/28957328266.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/3ucpfdq2m7qia4l9r2f0tm0jqu/87227911003.pdfIn PDF document text
    • http://ksiclub.org/projects/achievemore/admin/upload/fckImages/file/mitoxifejagedezorajipiker.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/39498700532.pdfIn PDF document text
    • https://ldcpc.com/ckfinder/userfiles/files/sepunowanunigajadiva.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///nerozafajibefar.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/84938991240.pdfIn PDF document text
    • http://micruts.org/userfiles/file/wakoraxatu.pdfIn PDF document text
    • http://gocoachfox.com/userfiles/file/wukiwitef.pdfIn PDF document text
    • http://szm.hu/userfiles/file/gevetofigopi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=clash+of+clans+hack+without+human+verificationPDF 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_off0000c349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC349 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5B 18028 bytes
SHA-256: f3c5a97d355050f99620e941096c7dd519ae9fa3db12dc5d78f975b97ddacf44
font_02_sfnt_off00010978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10978 10976 bytes
SHA-256: 241242acfaa0382cc21684497844fc87611e044c7fe38cf639300af9186743dc