Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfef9b3cce7a832f…

MALICIOUS

PDF

69.5 KB Created: 2021-02-21 03:30:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: e6abfbb782eb178ff12b0aa16d43d45a SHA-1: ce34f162aa4224a62c34cfd69f889fc25437ff52 SHA-256: cfef9b3cce7a832faabc0865a150c27604c398ff9177176ff8bc297c4b8b7649
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a large number of external links, with a critical heuristic identifying it as a PDF SEO link farm. One of the primary URLs, 'https://jacksth.ru/strik?utm_term=modular+origami+cube', appears to be a malicious redirect. While no scripts were explicitly extracted, the PDF structure and the presence of external links suggest an attempt to redirect users to malicious content.

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
  • 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/strik?utm_term=modular+origami+cube PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4475570/normal_5fd3d8e0ada3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496815/normal_5fdaceca76c3a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475864/normal_60211177b59bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418781/normal_600aa2566d996.pdfIn PDF document text
    • https://cdn.sqhk.co/ragejeli/IbgcWji/rumble_on_the_river_2020_wrestling.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494160/normal_5ff5176de8a4d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455894/normal_5ff419c309731.pdfIn PDF document text
    • https://cdn.sqhk.co/riketumes/K5CAieh/ordained_minister_license_texas.pdfIn PDF document text
    • https://cdn.sqhk.co/womalakifaxa/hgc1Jic/repair_master_3d_online_play_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427267/normal_5fde9f6122fa8.pdfIn PDF document text
    • https://josojizaxa.weebly.com/uploads/1/3/5/9/135966587/25b32bbd3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445544/normal_5ff06c8463e0d.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/xoferuzu/autocad_autolisp_developer_s_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/vutame/juwowuwibi.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_off0000d5ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5AE 5228 bytes
SHA-256: f7c7792f7ebfe7f80b3b3841c8a1b998758977d6066146efe6c9ae9eb93fbf69
font_01_sfnt_off0000e769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE769 10036 bytes
SHA-256: 4a7223f654918c99ed0c9ad3960f1ee6d46d7712de7021c3faa4e9cb2aa567c8

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