Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ff6e4f70316904a…

MALICIOUS

PDF

104.1 KB Created: 2021-02-16 01:11:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 1837f2dd4a2c8ea11862d940c7a370ac SHA-1: a71dd426613f73fb76721479ba24446021efc4d9 SHA-256: 4ff6e4f70316904ac30ae1b528662f3ef9aba2f6667603e3984422fe263e45f3
154 Risk Score

Malware Insights

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

The PDF contains embedded URLs, with one specifically identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains text related to computer hardware, which is likely used as a lure to trick users into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://yafferge.ru/wb?keyword=dell%20precision%20t3500%20cpu%20upgrade In PDF document text
    • http://strahuemsya.info/kapivimawomavajixemumifpguwd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444647/normal_5ffab3d67c0f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388426/normal_60203ddd96709.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476416/normal_5fff7af42d1ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501963/normal_600ae3b94f157.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472501/normal_601cf4a4be67c.pdfIn PDF document text
    • http://kukushpa.fun/faxunipiwoe46.pdfIn PDF document text
    • http://mastera-saydinga.ru/gefedamopuqypi7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372972/normal_60194d98314cd.pdfIn PDF document text
    • http://rostov-mobile-doctor.ru/699515476784wbzt.pdfIn PDF document text
    • http://cashbackk.site/1989384849f6kgu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381748/normal_5fe5997e9bc35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479688/normal_6029819ba04f0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368772/normal_5fe2cbf363e8c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/bagisi/diralomimexonajur.pdfIn PDF document text
    • https://s3.amazonaws.com/xilasisefi/kingsville_ontario_weather_report.pdfIn PDF document text
    • https://s3.amazonaws.com/wibadinavosunom/xuxenekibozu.pdfIn PDF document text
    • https://s3.amazonaws.com/luxelula/bapupegafadafovuletajim.pdfIn PDF document text
    • https://s3.amazonaws.com/dufekifaral/professional_clearance_letter_template.pdfIn PDF document text
    • https://s3.amazonaws.com/divelikubapiwaj/best_drawing_animation_app_android.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000149da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149DA 5552 bytes
SHA-256: 5f877f451b20fde7d98b79bf022fde92c2c5502299921aa2851d7fe3042a1c35
font_01_sfnt_off00015cc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CC9 11760 bytes
SHA-256: 7e10d01c7b82ae4c395a0a28a8f2449ec7697e45bd9986538d27ffa90195c623
font_02_sfnt_off000184bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x184BB 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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