Malicious PDF — malware analysis report

Static analysis result for SHA-256 e975be97ca2f0cbe…

MALICIOUS

PDF

73.3 KB Created: 2021-02-20 20:01:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 10213ef4dbb56a1bbb9ac174f155c837 SHA-1: e024687936eec63828a3b39e48d67bbe044e85d0 SHA-256: e975be97ca2f0cbeb7ac32a0298c3d20a1bb0e6722d3b9b2effa59c4c49be732
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, appears to be a lure for free Christmas carol lyric sheets, which is a common pretext for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the redirection to malicious infrastructure.

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
  • 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://crophysi.ru/123?utm_term=christmas+carol+lyric+sheets+free+download In PDF document text
    • https://jinajifija.weebly.com/uploads/1/3/4/8/134889339/losubofabe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384819/normal_5fe1d9e12a42a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387233/normal_60314b629d2f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445340/normal_60301afb41124.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403960/normal_6029d6623d80c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387704/normal_602a2a0514bbf.pdfIn PDF document text
    • https://soxiwavarado.weebly.com/uploads/1/3/1/4/131437421/56dcf05f8b54.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375204/normal_601a84235c840.pdfIn PDF document text
    • https://wipowolulufobud.weebly.com/uploads/1/3/1/4/131437369/d0bcbbf036f3.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/gedimuta/bts_ly_her_full_album.pdfIn PDF document text
    • https://s3.amazonaws.com/zarelusipofox/boogie_woogie_piano_exercises.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/boot_camp_assistant_6._1._0.pdfIn PDF document text
    • https://s3.amazonaws.com/defujo/fofomuzetu.pdfIn PDF document text
    • https://s3.amazonaws.com/juzewojavomofew/algebra_word_problems_with_answers_and_solutions.pdfIn PDF document text
    • https://s3.amazonaws.com/desekusoxi/aliens_vs_predator_game_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/paxunu/wivopurado.pdfIn PDF document text
    • https://s3.amazonaws.com/dewutexorob/30713023809.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_off0000e2ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AE 5360 bytes
SHA-256: abf7e1fb8e02d0fd910d700805b6b066c70c18c3a22ac20612adf09ece168218
font_01_sfnt_off0000f4cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CB 10180 bytes
SHA-256: f0c7d455b80d3b3c322c50d16f1a4393189880748d79a4df563fbd63ccf4ed52

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