Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ff5f08c2a6880c3…

MALICIOUS

PDF

65.3 KB Created: 2021-02-16 01:18:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: d3bb4626cdcdb961a4203f1e111efd8b SHA-1: 294c96ce4c925e3f84571deb09e57930589a484a SHA-256: 7ff5f08c2a6880c3b79d7ef8c081032ff8df9b81a0942b8e0a0b1b0f920e2755
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 SEO-optimized PDF documents. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or a link farm. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/strik?utm_term=what+is+verizon+fios+customer+service+number PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4393035/normal_5fe02ca9210d7.pdfIn PDF document text
    • https://cdn.sqhk.co/gugirejol/gg8Jyhb/wuvorunefurubowagagorat.pdfIn PDF document text
    • https://cdn.sqhk.co/zupitefa/jazo0Wm/space_frontier_roblox_wiki.pdfIn PDF document text
    • https://cdn.sqhk.co/tokotuxajif/idnjhJA/fomefexelemat.pdfIn PDF document text
    • https://cdn.sqhk.co/benibavagoge/hc1Ehh4/gajelajajukizow.pdfIn PDF document text
    • https://cdn.sqhk.co/xonarewu/ge3hdhg/doom_2_walkthrough_map_12.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392873/normal_5fed157dd6897.pdfIn PDF document text
    • https://tadeliganunuzax.weebly.com/uploads/1/3/0/9/130969808/kobifir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388416/normal_5fdb99774a5e8.pdfIn PDF document text
    • https://cdn.sqhk.co/nokikijun/XEKUwPA/space_jumper_h_m.pdfIn PDF document text
    • https://cdn.sqhk.co/jutusaxibu/Kgcjjat/14578428237.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446162/normal_5fdf09f05ddcd.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/bisegilupuf/formato_de_riesgo_de_trabajo_imss_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/xijuxosisomuna/nevabajedup.pdfIn PDF document text
    • https://s3.amazonaws.com/satuja/61763530445.pdfIn PDF document text
    • https://s3.amazonaws.com/dazemi/total_war_rome_2_epirus_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/sixenogafopoj/tamil_daily_sheet_calendar_2018_september.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_off0000c292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC292 5352 bytes
SHA-256: 2ec992b0335a16846b73d2b72aeab363b6da1a958f4d9f7995cfb61b8adec065
font_01_sfnt_off0000d4b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B6 10288 bytes
SHA-256: d08ed350126bc4abf45e157ebe3f8db108672eb177d00f364b1a83b7fbda744b

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