Malicious PDF — malware analysis report

Static analysis result for SHA-256 6acdd865d4697f88…

MALICIOUS

PDF

72.2 KB Created: 2021-02-26 14:45:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 614ef2775332eb36738a734f62e4f3fb SHA-1: 6de6011d3a948be3e702f85d3223ef9d03bb7704 SHA-256: 6acdd865d4697f886a5bfacaceca7a09d56cfe1979ea87c7ca4ff5631a9bb53b
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 at least one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a deliberate attempt to create a link farm, likely for SEO manipulation or to host malicious content. The ClamAV detection and ML classifier further support the malicious nature of the file, suggesting it's designed to lead users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://crophysi.ru/award?keyword=what+size+tires+are+on+a+2009+ford+focus In PDF document text
    • http://kixurox.getenjoyment.net/jbl_xtreme_2_speaker_review.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405929/normal_6029ac2f6f3d0.pdfIn PDF document text
    • https://dakufosaxem.weebly.com/uploads/1/3/4/7/134771611/wonamovofube_wiforasizuju_mojekezi_busujezot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423714/normal_6016faec03a2a.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/jolozidabi/airtel_tv_app_free_for_laptop.pdfIn PDF document text
    • https://s3.amazonaws.com/dezajok/trek_emonda_s5_2015_size_guide.pdfIn PDF document text
    • http://pabewuvuxaf.onlinewebshop.net/romantic_poem_for_my_wife_on_her_birthday.pdfIn PDF document text
    • http://jeputujakajaj.epizy.com/17742089560.pdfIn PDF document text
    • http://xolavozezimodan.onlinewebshop.net/relation_between_gdp_and_national_income.pdfIn PDF document text
    • https://s3.amazonaws.com/pizexopenaxu/jefuvajaxiwegopezuzumus.pdfIn PDF document text
    • https://s3.amazonaws.com/wemupajese/cuneiform_bone_fracture_icd_10.pdfIn PDF document text
    • https://s3.amazonaws.com/wotodedaruzuk/fozog.pdfIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/rilexuwasufadazo.pdfIn PDF document text
    • https://s3.amazonaws.com/sifawekujiki/voxengo_drumformer_product_key.pdfIn PDF document text
    • http://nosigegu.onlinewebshop.net/tazarewarirefotemado.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_off0000dd10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD10 5568 bytes
SHA-256: d5e04ebb892553ff1a6ac8da78b4597a03e565d67d3c449553ebaeb3ec663512
font_01_sfnt_off0000f00e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00E 10420 bytes
SHA-256: 175d5d2269530cbe923924b715c81c4837fc96c3d93982eeefd0495bc475ca74

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