Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c23f8023a761acb…

MALICIOUS

PDF

66.9 KB Created: 2020-12-22 15:46:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 7d5626e19fafa04dd9b38537600c39d4 SHA-1: 0823a611cc658f6a3a893f6cdace3c6b3dd33ab1 SHA-256: 1c23f8023a761acb5e6ae57a9a923bfb9ccb5e983e4cdf4b18692583a3238e26
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one pointing to a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to contain keywords related to programming, likely used as a lure to disguise the malicious links.

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://traffking.ru/strik?utm_term=arduino+buzzer+tone+function In PDF document text
    • https://kololeranazi.weebly.com/uploads/1/3/4/5/134583506/f6fa48dc.pdfIn PDF document text
    • https://kutumamam.weebly.com/uploads/1/3/4/8/134893394/mutor_dezimitewor_karexidavalavu.pdfIn PDF document text
    • https://lefusavuforuv.weebly.com/uploads/1/3/4/4/134490278/gipifor-pulugojul-zaduxejotewinur-zigerabad.pdfIn PDF document text
    • https://mupoveno.weebly.com/uploads/1/3/4/3/134371030/5453556.pdfIn PDF document text
    • https://nutifikidejuz.weebly.com/uploads/1/3/4/3/134347692/991757.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc6a4ef7d0c8f249d68fb01/t/5fccc0de662d5e24e09f7683/1607254240142/xapunudanefawugesipoxolo.pdfIn PDF document text
    • https://s3.amazonaws.com/dinilederu/geometrik_dizi_toplam_formlleri_ispat.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fe11ca3e3ba044ee8dffad7/t/5fe1f8aad6015b0ed4c69e4b/1608644784993/23461084137.pdfIn PDF document text
    • https://s3.amazonaws.com/wisatutadi/legacy_assurance_plan.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fe13a16c0a0fa116c3c3573/t/5fe1475f51c0c9581585ff52/1608599391449/50931169511.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbdeed26457125654ff07cd/1606282963288/jakidufivezopapivuti.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe351a9d79364840595499/1606300961087/nanibek.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_off0000c44b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC44B 4776 bytes
SHA-256: 7e192526ef1762c36c18a335a2dff246793b7c4df9222c3e6ae9daf9ce8a54f7
font_01_sfnt_off0000d4a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A6 13072 bytes
SHA-256: b4573076c2e0e8947a388a4fb5fa3eecc66473b6461ab3dce164f67dd5382ff0

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