Malicious PDF — malware analysis report

Static analysis result for SHA-256 f500acadefb4ca91…

MALICIOUS

PDF

72.2 KB Created: 2021-10-06 14:35:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6740ddf8f32a2e91b9475335eae1f7a5 SHA-1: 80be01520c7a312860289bae849341836065290d SHA-256: f500acadefb4ca911b1c3ad9ad7357ee246c95984202059b6d7898e7bd6d664c
146 Risk Score

Malware Insights

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

The sample was detected by ML classifiers and ClamAV as a malicious PDF, specifically a phishing trojan. It contains numerous external URIs pointing to potentially malicious websites, some of which are raw IP addresses, indicating a likely phishing or malware distribution scheme. The PDF is structured as a link farm on disposable hosting, further supporting its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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 https://garglob.ru/uplcv?utm_term=the+new+encyclopedia+of+modern+bodybuilding+review PDF link annotation
    • https://yodishit.com/uploads/userfiles/file/89404211258.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210929_162233.pdfPDF link annotation
    • http://irvinenott.co.uk/ckfinder/userfiles/files/96576076632.pdfIn PDF document text
    • http://malifer.hu/upload/file/22931654796.pdfIn PDF document text
    • https://vicareyou.com/userfiles/file/21627717591.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/6636136188.pdfIn PDF document text
    • http://droneducational.com/admin/userfiles/file/50258021610.pdfIn PDF document text
    • http://berbun.com/user_img/file/takufufuf.pdfIn PDF document text
    • http://aliguoriarchitetto.eu/userfiles/files/kezoroponireruzab.pdfIn PDF document text
    • http://hmed.vn/upload/files/76175913695.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/pegazunaxogokated.pdfIn PDF document text
    • http://gonzagafood.com/userfiles/files/38432583259.pdfIn PDF document text
    • http://xinge168.com/uploads/files/20210915141135_611547.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/65956001715.pdfIn PDF document text
    • https://pushtypathshala.com/demo/aims/files/images/files/905263555.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/nuwuwozevixowesuwafu.pdfIn PDF document text
    • http://atletika-pardubice.cz/files/file/73030414977.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/ravozazivaraleratir.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/sixebunamuwufu.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16137e34772cd6---99722546318.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/vorarimabinuzekitijapez.pdfIn PDF document text
    • http://longruiglass.com/ckfinder/userfiles/files/20210913_073756.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name/files/82321731953.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/vo15pedojhisjo4t1noeqlqcu0/xiwavedekavojabo.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_off0000b1bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1BF 11272 bytes
SHA-256: 5bdfc84ab0031fe63b86e39487808bc8e331197ae63796537fe5c22ba13ce80c
font_01_sfnt_off0000cb92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB92 17424 bytes
SHA-256: 2429097d356d615ade9e08c87c2c2ccd21df0e6fdf340a7c8a0c2cb2b3bf8449
font_02_sfnt_off0000f907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF907 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1