Malicious PDF — malware analysis report

Static analysis result for SHA-256 21b3ad951197094d…

MALICIOUS

PDF

77.7 KB Created: 2021-02-25 19:56:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 2afff258dc325ea947a72ce65fffc23d SHA-1: ba18a0f13d9a140d7d4676b9da223b6794c7ede1 SHA-256: 21b3ad951197094d5c26200687766ab41ffbb6a580533f7845144c8537db0601
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. It contains numerous embedded URLs, with a primary suspicious URL being https://maypoin.ru/wix?keyword=credit+sweep+solutions. The document body, though heavily obfuscated, suggests a theme related to financial solutions, likely intended as a lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to create a link farm on disposable hosting, further supporting a phishing or scam objective.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/wix?keyword=credit+sweep+solutions PDF link annotation
    • http://numulul.mygamesonline.org/lista_tascon_excel.pdfIn PDF document text
    • http://kufafukedexepix.mygamesonline.org/which_graco_stroller_is_best.pdfIn PDF document text
    • https://fikadodovawewa.weebly.com/uploads/1/3/4/3/134320255/folilidodawosavow.pdfIn PDF document text
    • https://danuredotur.weebly.com/uploads/1/3/2/8/132814989/pewoze.pdfIn PDF document text
    • http://pixunune.sportsontheweb.net/14998681240.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467564/normal_5ffbb05b3bbd0.pdfIn PDF document text
    • https://mafobosapufi.weebly.com/uploads/1/3/4/5/134505980/6763808.pdfIn PDF document text
    • http://wejixekolubuguw.iblogger.org/kirby_heritage_turbo_vacuum_bags.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fodakobenolam.rf.gd/13488258918.pdfIn PDF document text
    • http://wutejaxevewef.myartsonline.com/vitepa.pdfIn PDF document text
    • https://s3.amazonaws.com/minegikukovel/novubexitatezejubakef.pdfIn PDF document text
    • http://ruzizoxotawuva.epizy.com/berenem.pdfIn PDF document text
    • https://s3.amazonaws.com/fexuror/80870456069.pdfIn PDF document text
    • http://sutexuvidag.myartsonline.com/how_to_install_a_coleman_saluspa.pdfIn PDF document text
    • https://s3.amazonaws.com/dudujopixejikug/30567166926.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C6 4740 bytes
SHA-256: 49387aeba421a2c588e4afedfb6c818309365b01420923174ab447afa5c55bbf
font_01_sfnt_off00010501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10501 10704 bytes
SHA-256: 98a6ec497e2734f9ef381a5acf5e28d2ee28549c29ae79bae59698c36c2c56ba

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