Malicious PDF — malware analysis report

Static analysis result for SHA-256 d450eb4dc7bb6b36…

MALICIOUS

PDF

97.5 KB Created: 2021-05-25 04:16:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d824716b156fc2f9c723dd7f2256ae91 SHA-1: 9c10bccfa81231322318c87d0d3a2018bec60185 SHA-256: d450eb4dc7bb6b36499aa6db9337a4bb36aecd5cc9afa9671ff771b628342047
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lozipotod.ru/strik?utm_term=does+samsung+s20+have+5g PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4487007/normal_5fdc44ad4bbd1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402706/normal_5fe146ac19d47.pdfIn PDF document text
    • https://vixikubinimagap.weebly.com/uploads/1/3/3/9/133997110/wabadixidifo-farali.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366009/normal_60693a364a490.pdfIn PDF document text
    • https://siwinapevaz.weebly.com/uploads/1/3/4/3/134338690/911d1a4b.pdfIn PDF document text
    • https://jajixawu.weebly.com/uploads/1/3/5/9/135992574/webekutaxuf-nizuru-xosinixax.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470837/normal_5fff95aae3cd8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482858/normal_603b93d8256c2.pdfIn PDF document text
    • https://pugujexavifik.weebly.com/uploads/1/3/4/7/134702512/murubuv_panevimikoto_xapul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410191/normal_600f41fd2cee8.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/zopenave/sony_xbr43x830c_review.pdfIn PDF document text
    • https://s3.amazonaws.com/fexuror/worksheet_on_tenses_for_grade_8_icse.pdfIn PDF document text
    • https://s3.amazonaws.com/dufekifaral/mandatory_reconsideration_letter_template_tax_credits.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/196677ae-d59f-480f-91c6-88991e3bcf53/wudufemegubegutinusepe.pdfIn PDF document text
    • https://s3.amazonaws.com/pirosisob/relion_blood_pressure_cuff_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89032520-bb68-4591-8102-71d2df356996/how_to_make_a_google_cardboard_magnet.pdfIn PDF document text
    • https://s3.amazonaws.com/kujapomib/97889167266.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_off00013d61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D61 5428 bytes
SHA-256: 5fa7693f257d197b604cf0ef61ce2a933ff1398b4b54533dc20d27aee3d8d649
font_01_sfnt_off00014fcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FCB 11772 bytes
SHA-256: 2dfc2da4fcd48c6c98f0ec58ab5ff101da4ad489be6acfa586cd611932fba1f6

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