Malicious PDF — malware analysis report

Static analysis result for SHA-256 16b4193f608dbb75…

MALICIOUS

PDF

98.1 KB Created: 2021-02-24 00:29:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 4b5358117170ba7ca5d2d73322cac0fc SHA-1: ce0435a359d965a2c8359647c8049440b596eaa2 SHA-256: 16b4193f608dbb756c23aaba27723220b4f3842aaec9858e53729f37732436c1
184 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many pointing to disposable hosting services, and one directly to a known malicious redirector. The document body, though heavily obfuscated, contains text related to ethnic groups in Panama, likely used as a lure to disguise the malicious intent. The primary goal appears to be directing users to malicious websites for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://yafferge.ru/123?utm_term=tipos+de+grupos+etnicos+en+panama In PDF document text
    • https://sopoxovolofu.weebly.com/uploads/1/3/4/5/134509961/fffa736c273.pdfIn PDF document text
    • https://funifagokose.weebly.com/uploads/1/3/2/6/132681236/2949009.pdfIn PDF document text
    • https://dapalirodo.weebly.com/uploads/1/3/1/4/131483520/511746.pdfIn PDF document text
    • https://kalepadakib.weebly.com/uploads/1/3/1/6/131637037/5c5c41edc4.pdfIn PDF document text
    • https://dujomujur.weebly.com/uploads/1/3/4/8/134883281/kanakuvabirob_wedarun.pdfIn PDF document text
    • https://lulegosepo.weebly.com/uploads/1/3/0/9/130969478/tabutatetake-jibodax-pirupinuroxis-rigizuzu.pdfIn PDF document text
    • https://cdn.sqhk.co/migefareg/i1adgcv/moxagodaruzobekavukozub.pdfIn PDF document text
    • https://mavezuwunokil.weebly.com/uploads/1/3/4/6/134627141/f93642.pdfIn PDF document text
    • https://fatilisuwojumo.weebly.com/uploads/1/3/4/6/134652656/9971677.pdfIn PDF document text
    • https://dugaposiga.weebly.com/uploads/1/3/4/8/134857723/jepevonapusam.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/nisiwanolom/zulozalopode.pdfIn PDF document text
    • https://s3.amazonaws.com/wudibirewuduto/fedelizodoju.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000140a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140A3 5312 bytes
SHA-256: 74f23764fcadf4532cede461cfcc7c39301d9047eb5a87f60dc11520154868d6
font_01_sfnt_off0001529d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1529D 12080 bytes
SHA-256: 563a046a143543339ae218dcc3f6b782b7a5712454d8cc36121135084466f36c

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