Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e693d630f8050d3…

MALICIOUS

PDF

74.2 KB Created: 2021-02-21 00:48:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 43a6c4eecf84640eb0f45b48e0aa8364 SHA-1: 45ca578be0c15237b325f259a6fe0f2c539ea248 SHA-256: 4e693d630f8050d370263c871aa97da58f65f032c9f085376292c15f23ff730c
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 pointing to Weebly and other suspicious domains, indicative of a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

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://jacksth.ru/strik?utm_term=how+to+use+conair+steamer+for+face PDF link annotation
    • https://filafibiwi.weebly.com/uploads/1/3/4/3/134316544/zufufumijixivi.pdfIn PDF document text
    • https://butadopol.weebly.com/uploads/1/3/1/3/131378795/samire.pdfIn PDF document text
    • http://organic-ita.space/dudunakefevinqiwy.pdfIn PDF document text
    • https://zugufirit.weebly.com/uploads/1/3/1/1/131163535/8137634c86db.pdfIn PDF document text
    • http://mantenancie.com/tuzubozetavipix8vt6.pdfIn PDF document text
    • http://gatorama.fun/zevitugipuwazogonepotomu0jixi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471960/normal_60048affe4f2c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406454/normal_5fdc4855a63d0.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/luropi/lymphoma_contouring_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/zibenoroduzuw/45952020749.pdfIn PDF document text
    • https://s3.amazonaws.com/xoguwavosuje/smartphone_buying_guide_india_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/jebokizez/tividomufupisaje.pdfIn PDF document text
    • https://s3.amazonaws.com/gapivegek/57759427815.pdfIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/51989438609.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifawuvawot/fujowij.pdfIn PDF document text
    • https://s3.amazonaws.com/vesubodufisi/30240164797.pdfIn PDF document text
    • https://s3.amazonaws.com/mokamoba/simile_and_metaphor_worksheet_grade_4.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_off0000e5c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C3 5048 bytes
SHA-256: fc2309a36c212cd9b60ce8ae6e1b3443428b4596c6ade9050dd3a9ac4b87fd4e
font_01_sfnt_off0000f6ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EA 10816 bytes
SHA-256: eb7f59b536e2f91742e9f635083f2b0706261fa93070f9f150998e0a926482de

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