Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e36cfceb5f81940…

MALICIOUS

PDF

76.5 KB Created: 2021-01-25 21:56:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 945171de178bd86cf4f6c154d8a7305b SHA-1: a1de53367d760c1759e1e838becc0c013172c027 SHA-256: 0e36cfceb5f81940a5da6786d8cfadf38ad3f2d2a22838e39f07bcb9c2c6c058
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one critical heuristic identifying it as a PDF redirector link to malicious infrastructure. Another critical heuristic flags it as a PDF SEO link farm, indicating a large number of external PDF links. The ML classifier and ClamAV also strongly indicate maliciousness. The document body is heavily obfuscated and unreadable, but the presence of numerous links suggests a phishing or malware distribution attempt.

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://traffmen.ru/aws?utm_term=google+spreadsheet+api+python In PDF document text
    • https://naxulukituno.weebly.com/uploads/1/3/4/8/134879135/pejuwotevaputuv.pdfIn PDF document text
    • https://cdn.sqhk.co/getabemuto/hbHihfU/victory_missionary_baptist_church_las_vegas_facebook.pdfIn PDF document text
    • https://lesamasipedu.weebly.com/uploads/1/3/0/7/130739144/05008.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410201/normal_5ff3db667193a.pdfIn PDF document text
    • http://fiwadewemizoti.iblogger.org/novecento_baricco_libro.pdfIn PDF document text
    • https://xoxudepibedewem.weebly.com/uploads/1/3/5/3/135317482/tapebaruvoxokifirom.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485445/normal_5ff2cd35e3425.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471230/normal_5ff143600b62d.pdfIn PDF document text
    • https://cdn.sqhk.co/zipirevofu/5qOWzgi/36200827932.pdfIn PDF document text
    • https://pusudojajepi.weebly.com/uploads/1/3/5/3/135322366/wapejevelavig-kidegazezuwi-suletelefarob.pdfIn PDF document text
    • http://xasujaru.22web.org/implicit_differentiation_exercises_with_answers.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/wuzalugiseto/vosodeb.pdfIn PDF document text
    • https://s3.amazonaws.com/buxoparadazegu/consciousness_definition.pdfIn PDF document text
    • http://mizuvawilukilel.rf.gd/cutting_practice_sheets_for_preschoolers.pdfIn PDF document text
    • https://s3.amazonaws.com/vukujidor/automated_logic_thermostat_rs_pro_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/wudibirewuduto/38616380607.pdfIn PDF document text
    • http://lozepis.epizy.com/meteor_garden_2018_full.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_off0000e895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE895 5352 bytes
SHA-256: 32b778d01b32a468119e1477b6e7d46a44e34e992d632d9d78fd9464086145be
font_01_sfnt_off0000facf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACF 12808 bytes
SHA-256: 6eac733418d82e5402f4177204071ee4e4dee4fb0aede5d8e766ffa8cb468ce3

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