Malicious PDF — malware analysis report

Static analysis result for SHA-256 66c70e6cd39002b5…

MALICIOUS

PDF

73.0 KB Created: 2021-02-18 10:12:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: c9386e91bc18a949532b491f3716ab9c SHA-1: 3faa480d50f958cc970145284398b7aad23e014e SHA-256: 66c70e6cd39002b50456ca2e9d9476b3d4d24b11a70321b8dd71745ad03cd2c0
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 are SEO-themed and point to other PDF documents, indicating a link farm or redirection mechanism. One of the primary URLs, 'https://bologen.ru/wix?keyword=cicero+lipschitz+meaning', suggests a lure to a website. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

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://bologen.ru/wix?keyword=cicero+lipschitz+meaning PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4471682/normal_5fcea1f9b7cdf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481068/normal_6018cf084c409.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366668/normal_5fc730c7b7dba.pdfIn PDF document text
    • http://5coupon.info/68234316807pk4bl.pdfIn PDF document text
    • https://dibetoxiruvon.weebly.com/uploads/1/3/5/4/135400859/pezimowatemiro.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471512/normal_5fe8aee05c53a.pdfIn PDF document text
    • https://rusebetasamafi.weebly.com/uploads/1/3/3/9/133997145/eea0a694b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391340/normal_5ff3494698f0a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477655/normal_5ffaef772ab72.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lajimaju.epizy.com/58731847777.pdfIn PDF document text
    • https://s3.amazonaws.com/fedufiporara/luxottica_india_eyewear_pvt_ltd_annual_report.pdfIn PDF document text
    • http://buzekarutazobe.rf.gd/annual_physical_exam_form_template.pdfIn PDF document text
    • http://tuzasujonumex.epizy.com/alogliptin_metformin_brand_name.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_off0000e29d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE29D 5300 bytes
SHA-256: 098d3cb763ee60012f36053ae52ae8c3fbc320db1e2d4fe867670a57675bc330
font_01_sfnt_off0000f480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF480 10240 bytes
SHA-256: ef2e2d80e88219e1cad685bd625b7334beff88518d3ed07c537fccdff85c0e57

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