Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a9ed2e0d635a802…

MALICIOUS

PDF

67.4 KB Created: 2020-11-20 21:40:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: cf75624a9c174fa255d44fb9c9196f24 SHA-1: 260668bee368062a59ada1e5ff2d5778ba52ad4e SHA-256: 3a9ed2e0d635a802393d2ba68b90559e1e35b839d6b01fc9bfd81545c74d2339
164 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a malicious intent to manipulate search engine results or redirect users to potentially harmful content. The presence of an embedded URI and the ClamAV detection further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and link farm indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffking.ru/123?utm_term=blood+type+worksheet+high+school PDF link annotation
    • https://botomaluxezevip.weebly.com/uploads/1/3/4/3/134340767/6372855.pdfIn PDF document text
    • https://ludasajuwo.weebly.com/uploads/1/3/4/0/134096591/fenikubadodaw_serakojulaj.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/jamokaroxoj/uptet_written_exam_syllabus_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/vifusupegiza/faboxijukakinoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b81ec7d-7aa5-4f8f-b384-09565df9829f/bookworm_adventures_3_free_download_full_version.pdfIn PDF document text
    • https://s3.amazonaws.com/tazibabebamep/lucky_patcher_pro_apk_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/wikodizopolilisa.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzed/rexawojinitujixejulukelap.pdfIn PDF document text
    • https://s3.amazonaws.com/vinivuxo/loi_binomiale_ngative.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e852c275-7f93-4764-86c1-6313c407c11d/wulafuloxisikaruf.pdfIn PDF document text
    • https://s3.amazonaws.com/zalomi/59307325856.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/asymbiotic_nitrogen_fixation.pdfIn PDF document text
    • https://s3.amazonaws.com/samopakamefap/caterpillar_d398_parts_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/sazomo/13844924163.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_off0000ca66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA66 5432 bytes
SHA-256: 1b54cb7537ad46fc7a07b33e4523e92266bcb7f22c46ac5758be55dc6e0a4dc8
font_01_sfnt_off0000dd02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD02 10488 bytes
SHA-256: 203bfd2701629913d3a58c5c0f3c6b89a56ec700af847a676d2df7bd66b4a674

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