Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff71cdfd1b7eb4ef…

MALICIOUS

PDF

72.4 KB Created: 2021-01-31 20:11:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: dd927771ba8345a30d1346d313093392 SHA-1: 9102039f5142046c503580911e681b25c3f9ab0d SHA-256: ff71cdfd1b7eb4ef2d44d0e044034aacfce1d59291e6d56b6e0ca36798a6a72b
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF link farm' pointing to 'http://gikunipif.epizy.com/2445894751.pdf'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to potentially harmful content.

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/aws?utm_term=10+year+work+history+template PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4371553/normal_5fdb02f4c0a7d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476421/normal_5ffe66d691cad.pdfIn PDF document text
    • http://1xbet-registrat.site/ribokomipovexobutexadexitt6ibn.pdfIn PDF document text
    • https://berisojelo.weebly.com/uploads/1/3/0/8/130874511/powukafasazoka.pdfIn PDF document text
    • https://bojibelatos.weebly.com/uploads/1/3/4/0/134040608/60f61c6242bd6f.pdfIn PDF document text
    • http://microbestdigitalmeter.xyz/gelurisagutimuwomb06g.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377931/normal_5ffd3f15a7d68.pdfIn PDF document text
    • https://fiwadevu.weebly.com/uploads/1/3/4/5/134592392/xugetub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450724/normal_5fda9a03a5e77.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460970/normal_5fdd644d726d6.pdfIn PDF document text
    • https://biwasigefo.weebly.com/uploads/1/3/1/3/131398444/lekav.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496391/normal_6004e95fbed2f.pdfIn PDF document text
    • http://dibowofu.22web.org/ielts_reading_passage_beneath_the_canopy_answers.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495997/normal_5ff8852b33618.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382790/normal_5ff5ad6d3c95c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gikunipif.epizy.com/2445894751.pdfIn PDF document text
    • http://simipibenafar.epizy.com/neumonia_bacteriana_en_nios.pdfIn PDF document text
    • http://fivamoxopel.epizy.com/bootstrap_4_html_admin_template_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_off0000dd04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD04 5416 bytes
SHA-256: 7482d6636beb9d37af84a12c86a89566fa5c046a101458a1755f217fade9cbe2
font_01_sfnt_off0000ef61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF61 10932 bytes
SHA-256: cd3b677a9da11fa73d16333b4856b4be6eb7bade765413da3c82f313d2654312

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