Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b4c6a71bcd68824…

MALICIOUS

PDF

97.0 KB Created: 2021-03-04 05:53:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 0471237957ad5dbeea7dbf75f4dd1ad0 SHA-1: 4ba2dc94eb7cfd7f1df2902a0b5f1822aae4b418 SHA-256: 5b4c6a71bcd688247582d63c16c8a37ec82f26f8d12a96be4e38de3c3c64d380
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, suggesting a link farm or phishing attempt disguised as search results. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/wb?keyword=munchkin%20weighted%20straw%20cup%20replacement%20parts PDF link annotation
    • https://jipuziloki.weebly.com/uploads/1/3/2/6/132695969/felofinonilobivudubo.pdfIn PDF document text
    • https://cdn.sqhk.co/puwukuwos/QH7hbgg/balance_bmx_bikes_for_sale_uk.pdfIn PDF document text
    • https://minizaderi.weebly.com/uploads/1/3/4/3/134344024/3446dbf1c5a4.pdfIn PDF document text
    • https://cdn.sqhk.co/winelolibug/gdieagd/34873166763.pdfIn PDF document text
    • https://cdn.sqhk.co/xagegegozi/hrhaha8/nopijojuni.pdfIn PDF document text
    • https://maselevajaf.weebly.com/uploads/1/3/1/3/131398143/f60f0861d.pdfIn PDF document text
    • https://xolopebowuraj.weebly.com/uploads/1/3/4/6/134600193/bevorajomatop-zoxijafes-mesurosevibego.pdfIn PDF document text
    • https://cdn.sqhk.co/zalenemu/jjgihdS/hotels_near_chattanooga_tn_with_indoor_pool.pdfIn PDF document text
    • https://cdn.sqhk.co/wolebiduju/dTijrja/3960030578.pdfIn PDF document text
    • https://xigobiniliw.weebly.com/uploads/1/3/5/2/135298108/tipevalezopejudosebe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420597/normal_602064bae2169.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00013a03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A03 5648 bytes
SHA-256: 2656f8056996589544cb5f34c4d35abe93a9a9f71a25d7f2810896c5e6703c27
font_01_sfnt_off00014d3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D3C 12588 bytes
SHA-256: 127ebf2c816e7989ea188983bcc4b768f7804d6ddc482e11a1ebf6dfba1393a4