Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a1396e7a8aa4a91…

MALICIOUS

PDF

100.8 KB Created: 2021-02-18 19:29:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 7c3be71aac84cc8294c69a9fb4457f97 SHA-1: 662fad4a72936a72d32c5aeb281252cb4bde6b88 SHA-256: 5a1396e7a8aa4a91e74ca3973ef7cf88b63e0958580a5388d635bed1b33fc315
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to PDF files hosted on various domains, suggesting a link farm or redirection scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or a trojan delivery. Although no scripts were explicitly extracted, the PDF structure and numerous external 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://jacksth.ru/aws?utm_term=miss+peregrine%2527s+home+for+peculiar+children+book+summary PDF link annotation
    • https://cdn.sqhk.co/jasolizilaf/KjjhftM/auto_clicker_for_iphone_7.pdfIn PDF document text
    • https://wixozini.weebly.com/uploads/1/3/4/3/134383912/miwarimujutu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465267/normal_5fdf39fc637e1.pdfIn PDF document text
    • https://tesafugefiwa.weebly.com/uploads/1/3/5/3/135318727/2594110.pdfIn PDF document text
    • https://zetojaxonafavop.weebly.com/uploads/1/3/5/3/135309172/2187e2c290c8e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475565/normal_600831a57f5fe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371536/normal_6009a607f1f91.pdfIn PDF document text
    • http://tvoyoproc.fun/download_murottal_quran_30_juz_misyari_rasyidwzmmv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482623/normal_60043b87e01fb.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/wazotojemov/78891708779.pdfIn PDF document text
    • https://s3.amazonaws.com/rurosaveruk/74366008692.pdfIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/14792263639.pdfIn PDF document text
    • https://s3.amazonaws.com/fomudebipefasu/stamford_connecticut_weather_report.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_off0001498b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1498B 5912 bytes
SHA-256: 826262c04ecee3d34a3f7f3ff1dd198a634d6e9a85c965b59ac557e6eecf2873
font_01_sfnt_off00015d9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D9D 11768 bytes
SHA-256: bfa4103d3a75b60a3babad2f2b7b2ac991693b2b030eab0e9624d593aeb40e6b

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