Malicious PDF — malware analysis report

Static analysis result for SHA-256 f242e198cefc1aa4…

MALICIOUS

PDF

70.4 KB Created: 2020-12-21 12:42:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: a398975ed4a27fbd99c239a6b6d77f66 SHA-1: b50f9f6ce20f0046477910cd8bafca2d92ee8c24 SHA-256: f242e198cefc1aa49b4df8ee1c136f9116f06b10b79fc7b63403967bb1da763f
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many of which are numeric slugs pointing to PDF files, indicating a link farm or SEO spamming technique. One of the embedded URLs, 'https://trafficel.ru/strik?utm_term=world+history+quiz+questions+and+answers', is flagged as unknown reputation, suggesting a potential phishing or malicious redirect. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

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://trafficel.ru/strik?utm_term=world+history+quiz+questions+and+answers PDF link annotation
    • https://tebamebameden.weebly.com/uploads/1/3/3/9/133997375/c6f83cbddb.pdfIn PDF document text
    • https://kutowovazamil.weebly.com/uploads/1/3/4/3/134362820/tusisesezezebo.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/bizamesuwepe/22181956094.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0d55090-8f9f-4eac-bd7e-c146399e0d2e/maths_for_8_year_olds_printable.pdfIn PDF document text
    • https://s3.amazonaws.com/pesetufavo/74978207704.pdfIn PDF document text
    • https://s3.amazonaws.com/palevijuj/camera_raw_9._1_full_crack.pdfIn PDF document text
    • https://s3.amazonaws.com/poresi/fcpx_slideshow_template_free.pdfIn PDF document text
    • https://s3.amazonaws.com/vinejivunitego/66502972337.pdfIn PDF document text
    • https://s3.amazonaws.com/bisute/60272055896.pdfIn PDF document text
    • https://s3.amazonaws.com/juzinaramip/remicade_infusion_protocol.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0f0de5bcb0228a282afe8/t/5fc31f89e18c5c478e620759/1606623114478/72051438363.pdfIn PDF document text
    • https://s3.amazonaws.com/petuzutemixuvod/zoxuzeke.pdfIn PDF document text
    • https://s3.amazonaws.com/bubodeliza/2003999738.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc66b1c3398ff7515537f6c/t/5fcd5399c836a917f91cd011/1607291801901/bemijofirazenexilerin.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzumeb/words_for_pain_free.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_off0000d56a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD56A 5296 bytes
SHA-256: 4b3abbc8abbf457495478f6133d9ab087b9065957a8e8f07e6c686796a590061
font_01_sfnt_off0000e782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE782 10896 bytes
SHA-256: 7b00a0e2eb148a9ff30438d8ccc8e216ed2299708a82c1ffa6ff49bcc24a9663

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