Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bc2a437411b1437…

MALICIOUS

PDF

78.1 KB Created: 2021-05-23 05:02:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: c2c0143d2fbcfe510bdefb4a12865414 SHA-1: 49a82d168e31cd3a22a05ac5c2048bc455a999ad SHA-256: 9bc2a437411b14377d8fe42c6f5100d488ff273ba11f43318a28ba17c117b781
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO link farms or distributing malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as Pdf.Phishing.Trojan. The embedded URLs suggest an attempt to redirect the user to potentially harmful websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://nipisod.ru/strik?utm_term=literary+devices+in+to+kill+a+mockingbird+chapter+1 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4448740/normal_60531af7a5706.pdfIn PDF document text
    • https://sinidagiritab.weebly.com/uploads/1/3/5/3/135386058/dobepidix_dodiba_depulaved.pdfIn PDF document text
    • https://wezusuruga.weebly.com/uploads/1/3/4/0/134096163/vefimopep.pdfIn PDF document text
    • https://xifuvago.weebly.com/uploads/1/3/0/8/130813557/4990036.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488316/normal_605b08cb3d6e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487419/normal_60104660e0192.pdfIn PDF document text
    • https://wugeneziwepuzi.weebly.com/uploads/1/3/4/4/134494794/ec6ca504af7d41e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412778/normal_6006e2a648787.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445570/normal_6039e1bdcb741.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466662/normal_5fd3cf96e313f.pdfIn PDF document text
    • https://jagotizepevex.weebly.com/uploads/1/3/4/4/134464701/vosaruga-lokamogiv-kutelorupunani-fixariw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419437/normal_5ff6734d67fef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zugutixe/tonicity_and_osmosis_worksheet_biology_101_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/dewutexorob/apeman_4k_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/memobofilenabon/where_to_buy_skyworth_remote_control.pdfIn PDF document text
    • https://s3.amazonaws.com/bolovopizonuki/adobe_acrobat_reader_problems_files.pdfIn PDF document text
    • https://s3.amazonaws.com/kexamoxusinixu/the_mortal_instruments_series_by_cassandra_clare.pdfIn PDF document text
    • https://s3.amazonaws.com/daxemo/brown_sugar_full_movie.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_off0000f2e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E3 5844 bytes
SHA-256: f26a87664a09925a4695c28cc38c7785f4f633ff6997bad481d63754d2bf9be0
font_01_sfnt_off000106b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B1 10680 bytes
SHA-256: 5bfa1338a76039aa0c28edc5a49701602b55d37fec301d745795c83a6e8fbf8a

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