Malicious PDF — malware analysis report

Static analysis result for SHA-256 885216924ce4aa7c…

MALICIOUS

PDF

88.4 KB Created: 2021-03-29 22:20:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: b25374192fe74a254c1d42dbcc7ede0f SHA-1: ec6c21ccf263ccc98d03610d9ad9d935366b2f9f SHA-256: 885216924ce4aa7cf99a2a03fb4f3f60b14f7332813a18b49277ae5899425b48
214 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, with a critical heuristic firing indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to search queries, suggesting a phishing or redirection attempt. The presence of embedded URLs and the ML classifier's high confidence score further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://dafemum.ru/award?keyword=asrb+ldc+2020+question+paper+pdf In PDF document text
    • http://nonowun.mywebcommunity.org/36887289510.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505820/normal_5fdb702a59100.pdfIn PDF document text
    • https://tufanemoxidubux.weebly.com/uploads/1/3/4/3/134315727/gunudofukifoza-geguk-jixagob.pdfIn PDF document text
    • https://jevixivuxed.weebly.com/uploads/1/3/4/6/134622771/gimixud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453117/normal_6039ee297c30a.pdfIn PDF document text
    • https://pinozawekik.weebly.com/uploads/1/3/4/5/134589254/suwazemewaj.pdfIn PDF document text
    • http://kugewezebuvigiw.mygamesonline.org/70739008811.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493867/normal_605192291c3f7.pdfIn PDF document text
    • https://nabinavupofi.weebly.com/uploads/1/3/5/3/135350319/pozefurixagiz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410191/normal_6022f8afb8516.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/lukepepe/43667119283.pdfIn PDF document text
    • https://s3.amazonaws.com/bexolamabad/67713987388.pdfIn PDF document text
    • https://113c517c-d7b0-4b36-99d7-6722bcb7ef36.filesusr.com/ugd/8e66a5_12531649a3e942de9c1e685ee14646ea.pdf?index=trueIn PDF document text
    • https://7f1888b6-cdab-4603-9914-1cf81a8b29aa.filesusr.com/ugd/6846fe_dd7d60a3651844789701c70cf8ee877d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dazuxujepov/guided_math_in_action.pdfIn PDF document text
    • https://s3.amazonaws.com/vavapekadoliti/57270591064.pdfIn PDF document text
    • https://8a833fea-7c9a-4d2e-a5a7-d3590f42a3e5.filesusr.com/ugd/9aab09_47f637ea657444ce979ead27f63089c3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lekelepowo/dresden_files_tv_show_bob.pdfIn PDF document text
    • https://s3.amazonaws.com/lodazojamuva/fotufuwabaxeluneput.pdfIn PDF document text
    • https://ecf1b359-4982-44d9-836f-7e6f5fec4aa1.filesusr.com/ugd/da15c8_d642b1f011bc4d4693b4f0943c1a5d57.pdf?index=trueIn PDF document text
    • https://37bdae34-bb2f-403f-997c-54a7c09d9c06.filesusr.com/ugd/dc98cc_042a8f9a8433461b83312eecfda5b8e1.pdf?index=trueIn 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_off00010c90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C90 5680 bytes
SHA-256: 96d0790bd777b92bf022d7c9a2dbd423a515216a90793fd200472a220d14a73c
font_01_sfnt_off00011fe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE7 10644 bytes
SHA-256: 808c207371b637fb75743a59b68fa09e26fd776e6100812429c3592add90b51f
font_02_sfnt_off0001445b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1445B 4064 bytes
SHA-256: 841efa72afa0de7e6da37c9fdc7bb109fe2c72e9013483bf8f340837223f8054

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